chan_misdn.c

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/*
 * Asterisk -- An open source telephony toolkit.
 * 
 * Copyright (C) 2004 - 2006, Christian Richter
 *
 * Christian Richter <crich@beronet.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 *
 */

/*!
 * \file
 *
 * \brief the chan_misdn channel driver for Asterisk
 *
 * \author Christian Richter <crich@beronet.com>
 *
 * \extref MISDN http://www.misdn.org/
 *
 * \ingroup channel_drivers
 */

/*** MODULEINFO
   <depend>isdnnet</depend>
   <depend>misdn</depend>
   <depend>suppserv</depend>
 ***/
#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 284478 $")

#include <stdio.h>
#include <pthread.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <signal.h>
#include <sys/file.h>
#include <semaphore.h>

#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/options.h"
#include "asterisk/io.h"
#include "asterisk/frame.h"
#include "asterisk/translate.h"
#include "asterisk/cli.h"
#include "asterisk/musiconhold.h"
#include "asterisk/dsp.h"
#include "asterisk/translate.h"
#include "asterisk/config.h"
#include "asterisk/file.h"
#include "asterisk/callerid.h"
#include "asterisk/indications.h"
#include "asterisk/app.h"
#include "asterisk/features.h"
#include "asterisk/term.h"
#include "asterisk/sched.h"
#include "asterisk/stringfields.h"
#include "asterisk/causes.h"

#include "chan_misdn_config.h"
#include "isdn_lib.h"

char global_tracefile[BUFFERSIZE + 1];

static int g_config_initialized = 0;

struct misdn_jb{
   int size;
   int upper_threshold;
   char *samples, *ok;
   int wp,rp;
   int state_empty;
   int state_full;
   int state_buffer;
   int bytes_wrote;
   ast_mutex_t mutexjb;
};



/*! \brief allocates the jb-structure and initialize the elements */
struct misdn_jb *misdn_jb_init(int size, int upper_threshold);

/*! \brief frees the data and destroys the given jitterbuffer struct */
void misdn_jb_destroy(struct misdn_jb *jb);

/*! \brief fills the jitterbuffer with len data returns < 0 if there was an
error (buffer overrun). */
int misdn_jb_fill(struct misdn_jb *jb, const char *data, int len);

/*! \brief gets len bytes out of the jitterbuffer if available, else only the
available data is returned and the return value indicates the number
of data. */
int misdn_jb_empty(struct misdn_jb *jb, char *data, int len);


/* BEGIN: chan_misdn.h */

ast_mutex_t release_lock;

enum misdn_chan_state {
   MISDN_NOTHING=0,  /*!< at beginning */
   MISDN_WAITING4DIGS, /*!<  when waiting for infos */
   MISDN_EXTCANTMATCH, /*!<  when asterisk couldn't match our ext */
   MISDN_INCOMING_SETUP, /*!<  for incoming setups*/
   MISDN_DIALING, /*!<  when pbx_start */
   MISDN_PROGRESS, /*!<  we got a progress */
   MISDN_PROCEEDING, /*!<  we got a progress */
   MISDN_CALLING, /*!<  when misdn_call is called */
   MISDN_CALLING_ACKNOWLEDGE, /*!<  when we get SETUP_ACK */
   MISDN_ALERTING, /*!<  when Alerting */
   MISDN_BUSY, /*!<  when BUSY */
   MISDN_CONNECTED, /*!<  when connected */
   MISDN_DISCONNECTED, /*!<  when connected */
   MISDN_CLEANING, /*!< when hangup from * but we were connected before */
};

#define ORG_AST 1
#define ORG_MISDN 2

enum misdn_hold_state {
   MISDN_HOLD_IDLE,     /*!< HOLD not active */
   MISDN_HOLD_ACTIVE,      /*!< Call is held */
   MISDN_HOLD_TRANSFER, /*!< Held call is being transferred */
   MISDN_HOLD_DISCONNECT,  /*!< Held call is being disconnected */
};
struct hold_info {
   /*!
    * \brief Call HOLD state.
    */
   enum misdn_hold_state state;
   /*!
    * \brief Logical port the channel call record is HELD on
    * because the B channel is no longer associated.
    */
   int port;

   /*!
    * \brief Original B channel number the HELD call was using.
    * \note Used only for debug display messages.
    */
   int channel;
};

/*!
 * \brief Channel call record structure
 */
struct chan_list {
   /*! 
    * \brief The "allowed_bearers" string read in from /etc/asterisk/misdn.conf
    */
   char allowed_bearers[BUFFERSIZE + 1];
   
   /*! 
    * \brief State of the channel
    */
   enum misdn_chan_state state;

   /*! 
    * \brief TRUE if a hangup needs to be queued 
    * \note This is a debug flag only used to catch calls to hangup_chan() that are already hungup.
    */
   int need_queue_hangup;

   /*!
    * \brief TRUE if a channel can be hung up by calling asterisk directly when done.
    */
   int need_hangup;

   /*!
    * \brief TRUE if we could send an AST_CONTROL_BUSY if needed.
    */
   int need_busy;
   
   /*!
    * \brief Who originally created this channel. ORG_AST or ORG_MISDN
    */
   int originator;

   /*! 
    * \brief TRUE of we are not to respond immediately to a SETUP message.  Check the dialplan first.
    * \note The "noautorespond_on_setup" boolean read in from /etc/asterisk/misdn.conf
    */
   int noautorespond_on_setup;
   
   int norxtone;  /* Boolean assigned values but the value is not used. */

   /*!
    * \brief TRUE if we are not to generate tones (Playtones)
    */
   int notxtone; 

   /*!
    * \brief TRUE if echo canceller is enabled.  Value is toggled.
    */
   int toggle_ec;
   
   /*!
    * \brief TRUE if you want to send Tone Indications to an incoming
    * ISDN channel on a TE Port.
    * \note The "incoming_early_audio" boolean read in from /etc/asterisk/misdn.conf
    */
   int incoming_early_audio;

   /*!
    * \brief TRUE if DTMF digits are to be passed inband only.
    * \note It is settable by the misdn_set_opt() application.
    */
   int ignore_dtmf;

   /*!
    * \brief Pipe file descriptor handles array. 
    * Read from pipe[0], write to pipe[1] 
    */
   int pipe[2];

   /*!
    * \brief Read buffer for inbound audio from pipe[0]
    */
   char ast_rd_buf[4096];

   /*!
    * \brief Inbound audio frame returned by misdn_read().
    */
   struct ast_frame frame;

   /*!
    * \brief Fax detection option. (0:no 1:yes 2:yes+nojump)
    * \note The "faxdetect" option string read in from /etc/asterisk/misdn.conf
    * \note It is settable by the misdn_set_opt() application.
    */
   int faxdetect;

   /*!
    * \brief Number of seconds to detect a Fax machine when detection enabled.
    * \note 0 disables the timeout.
    * \note The "faxdetect_timeout" value read in from /etc/asterisk/misdn.conf
    */
   int faxdetect_timeout;

   /*!
    * \brief Starting time of fax detection with timeout when nonzero.
    */
   struct timeval faxdetect_tv;

   /*!
    * \brief TRUE if a fax has been detected.
    */
   int faxhandled;

   /*!
    * \brief TRUE if we will use the Asterisk DSP to detect DTMF/Fax
    * \note The "astdtmf" boolean read in from /etc/asterisk/misdn.conf
    */
   int ast_dsp;

   /*!
    * \brief Jitterbuffer length
    * \note The "jitterbuffer" value read in from /etc/asterisk/misdn.conf
    */
   int jb_len;

   /*!
    * \brief Jitterbuffer upper threshold
    * \note The "jitterbuffer_upper_threshold" value read in from /etc/asterisk/misdn.conf
    */
   int jb_upper_threshold;

   /*!
    * \brief Allocated jitterbuffer controller
    * \note misdn_jb_init() creates the jitterbuffer.
    * \note Must use misdn_jb_destroy() to clean up. 
    */
   struct misdn_jb *jb;
   
   /*!
    * \brief Allocated DSP controller
    * \note ast_dsp_new() creates the DSP controller.
    * \note Must use ast_dsp_free() to clean up. 
    */
   struct ast_dsp *dsp;

   /*!
    * \brief Associated Asterisk channel structure.
    */
   struct ast_channel * ast;

   //int dummy;   /* Not used */
  
   /*!
    * \brief Associated B channel structure.
    */
   struct misdn_bchannel *bc;

   /*!
    * \brief HELD channel call information
    */
   struct hold_info hold;

   /*!
    * \brief From associated B channel: Layer 3 process ID
    * \note Used to find the HELD channel call record when retrieving a call.
    */
   unsigned int l3id;

   /*! 
    * \brief From associated B channel: B Channel mISDN driver layer ID from mISDN_get_layerid()
    * \note Used only for debug display messages.
    */
   int addr;

   /*!
    * \brief Incoming call dialplan context identifier.
    * \note The "context" string read in from /etc/asterisk/misdn.conf
    */
   char context[AST_MAX_CONTEXT];

   /*!
    * \brief The configured music-on-hold class to use for this call.
    * \note The "musicclass" string read in from /etc/asterisk/misdn.conf
    */
   char mohinterpret[MAX_MUSICCLASS];

   //int zero_read_cnt; /* Not used */

   /*!
    * \brief Number of outgoing audio frames dropped since last debug gripe message.
    */
   int dropped_frame_cnt;

   /*!
    * \brief TRUE if we must do the ringback tones.
    * \note The "far_alerting" boolean read in from /etc/asterisk/misdn.conf
    */
   int far_alerting;

   /*!
    * \brief TRUE if NT should disconnect an overlap dialing call when a timeout occurs.
    * \note The "nttimeout" boolean read in from /etc/asterisk/misdn.conf
    */
   int nttimeout;

   /*!
    * \brief Other channel call record PID 
    * \note Value imported from Asterisk environment variable MISDN_PID 
    */
   int other_pid;

   /*!
    * \brief Bridged other channel call record
    * \note Pointer set when other_pid imported from Asterisk environment 
    * variable MISDN_PID by either side.
    */
   struct chan_list *other_ch;

   /*!
    * \brief Tone zone sound used for dialtone generation.
    * \note Used as a boolean.  Non-NULL to prod generation if enabled. 
    */
   const struct tone_zone_sound *ts;
   
   /*!
    * \brief Enables overlap dialing for the set amount of seconds.  (0 = Disabled)
    * \note The "overlapdial" value read in from /etc/asterisk/misdn.conf
    */
   int overlap_dial;

   /*!
    * \brief Overlap dialing timeout Task ID.  -1 if not running.
    */
   int overlap_dial_task;

   /*!
    * \brief overlap_tv access lock.
    */
   ast_mutex_t overlap_tv_lock;

   /*!
    * \brief Overlap timer start time.  Timer restarted for every digit received.
    */
   struct timeval overlap_tv;
  
   //struct chan_list *peer;  /* Not used */

   /*!
    * \brief Next channel call record in the list.
    */
   struct chan_list *next;
   //struct chan_list *prev;     /* Not used */
   //struct chan_list *first; /* Not used */
};



void export_ch(struct ast_channel *chan, struct misdn_bchannel *bc, struct chan_list *ch);
void import_ch(struct ast_channel *chan, struct misdn_bchannel *bc, struct chan_list *ch);

struct robin_list {
   char *group;
   int port;
   int channel;
   struct robin_list *next;
   struct robin_list *prev;
};
static struct robin_list *robin = NULL;



static struct ast_frame *process_ast_dsp(struct chan_list *tmp, struct ast_frame *frame);



static void free_robin_list(void)
{
   struct robin_list *r;
   struct robin_list *next;

   for (r = robin, robin = NULL; r; r = next) {
      next = r->next;
      free(r->group);
      free(r);
   }
}

static struct robin_list* get_robin_position (char *group) 
{
   struct robin_list *new;
   struct robin_list *iter = robin;
   for (; iter; iter = iter->next) {
      if (!strcasecmp(iter->group, group)) {
         return iter;
      }
   }
   new = calloc(1, sizeof(*new));
   if (!new) {
      return NULL;
   }
   new->group = strdup(group);
   if (!new->group) {
      free(new);
      return NULL;
   }
   new->port = 0;
   new->channel = 0;
   if (robin) {
      new->next = robin;
      robin->prev = new;
   }
   robin = new;
   return robin;
}


/*! \brief the main schedule context for stuff like l1 watcher, overlap dial, ... */
static struct sched_context *misdn_tasks = NULL;
static pthread_t misdn_tasks_thread;

static int *misdn_ports;

static void chan_misdn_log(int level, int port, char *tmpl, ...)
   __attribute__((format(printf, 3, 4)));

static struct ast_channel *misdn_new(struct chan_list *cl, int state,  char *exten, char *callerid, int format, int port, int c);
static void send_digit_to_chan(struct chan_list *cl, char digit );

static int pbx_start_chan(struct chan_list *ch);

#define MISDN_ASTERISK_TECH_PVT(ast) ast->tech_pvt
#define MISDN_ASTERISK_PVT(ast) 1

#include "asterisk/strings.h"

/* #define MISDN_DEBUG 1 */

static const char misdn_type[] = "mISDN";

static int tracing = 0 ;

/*! \brief Only alaw and mulaw is allowed for now */
static int prefformat =  AST_FORMAT_ALAW ; /*  AST_FORMAT_SLINEAR ;  AST_FORMAT_ULAW | */

static int *misdn_debug;
static int *misdn_debug_only;
static int max_ports;

static int *misdn_in_calls;
static int *misdn_out_calls;


struct chan_list dummy_cl;

/*!
 * \brief Global channel call record list head.
 */
struct chan_list *cl_te=NULL;
ast_mutex_t cl_te_lock;

static enum event_response_e
cb_events(enum event_e event, struct misdn_bchannel *bc, void *user_data);

static void send_cause2ast(struct ast_channel *ast, struct misdn_bchannel*bc, struct chan_list *ch);

static void cl_queue_chan(struct chan_list **list, struct chan_list *chan);
static void cl_dequeue_chan(struct chan_list **list, struct chan_list *chan);
static struct chan_list *find_chan_by_bc(struct chan_list *list, struct misdn_bchannel *bc);
static struct chan_list *find_chan_by_pid(struct chan_list *list, int pid);



static int dialtone_indicate(struct chan_list *cl);
static void hanguptone_indicate(struct chan_list *cl);
static int stop_indicate(struct chan_list *cl);

static int start_bc_tones(struct chan_list *cl);
static int stop_bc_tones(struct chan_list *cl);
static void release_chan_early(struct chan_list *ch);
static void release_chan(struct chan_list *ch, struct misdn_bchannel *bc);

static int misdn_check_l2l1(struct ast_channel *chan, void *data);
static int misdn_set_opt_exec(struct ast_channel *chan, void *data);
static int misdn_facility_exec(struct ast_channel *chan, void *data);

int chan_misdn_jb_empty(struct misdn_bchannel *bc, char *buf, int len);


void debug_numplan(int port, int numplan, char *type);


int add_out_calls(int port);
int add_in_calls(int port);


#ifdef MISDN_1_2
static int update_pipeline_config(struct misdn_bchannel *bc);
#else
static int update_ec_config(struct misdn_bchannel *bc);
#endif



/*************** Helpers *****************/

static struct chan_list * get_chan_by_ast(struct ast_channel *ast)
{
   struct chan_list *tmp;
  
   for (tmp=cl_te; tmp; tmp = tmp->next) {
      if ( tmp->ast == ast ) return tmp;
   }
  
   return NULL;
}

static struct chan_list * get_chan_by_ast_name(char *name)
{
   struct chan_list *tmp;
  
   for (tmp=cl_te; tmp; tmp = tmp->next) {
      if ( tmp->ast  && strcmp(tmp->ast->name,name) == 0) return tmp;
   }
  
   return NULL;
}



struct allowed_bearers {
   char *name;       /*!< Bearer capability name string used in /etc/misdn.conf allowed_bearers */
   char *display;    /*!< Bearer capability displayable name */
   int cap;       /*!< SETUP message bearer capability field code value */
   int deprecated;      /*!< TRUE if this entry is deprecated. (Misspelled or bad name to use) */
};

/* *INDENT-OFF* */
static const struct allowed_bearers allowed_bearers_array[]= {
   /* Name,                      Displayable Name       Bearer Capability,                    Deprecated */
   { "speech",                  "Speech",               INFO_CAPABILITY_SPEECH,               0 },
   { "3_1khz",                  "3.1KHz Audio",         INFO_CAPABILITY_AUDIO_3_1K,           0 },
   { "digital_unrestricted",    "Unrestricted Digital", INFO_CAPABILITY_DIGITAL_UNRESTRICTED, 0 },
   { "digital_restricted",      "Restricted Digital",   INFO_CAPABILITY_DIGITAL_RESTRICTED,   0 },
   { "digital_restriced",       "Restricted Digital",   INFO_CAPABILITY_DIGITAL_RESTRICTED,   1 }, /* Allow misspelling for backwards compatibility */
   { "video",                   "Video",                INFO_CAPABILITY_VIDEO,                0 }
};
/* *INDENT-ON* */

static const char *bearer2str(int cap)
{
   unsigned index;

   for (index = 0; index < ARRAY_LEN(allowed_bearers_array); ++index) {
      if (allowed_bearers_array[index].cap == cap) {
         return allowed_bearers_array[index].display;
      }
   }  /* end for */

   return "Unknown Bearer";
}


static void print_facility(struct FacParm *fac, struct misdn_bchannel *bc)
{
   switch (fac->Function) {
   case Fac_CD:
      chan_misdn_log(1,bc->port," --> calldeflect to: %s, presentable: %s\n", fac->u.CDeflection.DeflectedToNumber,
         fac->u.CDeflection.PresentationAllowed ? "yes" : "no");
      break;
   case Fac_AOCDCurrency:
      if (fac->u.AOCDcur.chargeNotAvailable)
         chan_misdn_log(1,bc->port," --> AOCD currency: charge not available\n");
      else if (fac->u.AOCDcur.freeOfCharge)
         chan_misdn_log(1,bc->port," --> AOCD currency: free of charge\n");
      else if (fac->u.AOCDchu.billingId >= 0)
         chan_misdn_log(1,bc->port," --> AOCD currency: currency:%s amount:%d multiplier:%d typeOfChargingInfo:%s billingId:%d\n",
            fac->u.AOCDcur.currency, fac->u.AOCDcur.currencyAmount, fac->u.AOCDcur.multiplier,
            (fac->u.AOCDcur.typeOfChargingInfo == 0) ? "subTotal" : "total", fac->u.AOCDcur.billingId);
      else
         chan_misdn_log(1,bc->port," --> AOCD currency: currency:%s amount:%d multiplier:%d typeOfChargingInfo:%s\n",
            fac->u.AOCDcur.currency, fac->u.AOCDcur.currencyAmount, fac->u.AOCDcur.multiplier,
            (fac->u.AOCDcur.typeOfChargingInfo == 0) ? "subTotal" : "total");
      break;
   case Fac_AOCDChargingUnit:
      if (fac->u.AOCDchu.chargeNotAvailable)
         chan_misdn_log(1,bc->port," --> AOCD charging unit: charge not available\n");
      else if (fac->u.AOCDchu.freeOfCharge)
         chan_misdn_log(1,bc->port," --> AOCD charging unit: free of charge\n");
      else if (fac->u.AOCDchu.billingId >= 0)
         chan_misdn_log(1,bc->port," --> AOCD charging unit: recordedUnits:%d typeOfChargingInfo:%s billingId:%d\n",
            fac->u.AOCDchu.recordedUnits, (fac->u.AOCDchu.typeOfChargingInfo == 0) ? "subTotal" : "total", fac->u.AOCDchu.billingId);
      else
         chan_misdn_log(1,bc->port," --> AOCD charging unit: recordedUnits:%d typeOfChargingInfo:%s\n",
            fac->u.AOCDchu.recordedUnits, (fac->u.AOCDchu.typeOfChargingInfo == 0) ? "subTotal" : "total");
      break;
   default:
      chan_misdn_log(1,bc->port," --> unknown facility\n");
      break;
   }
}

static void print_bearer(struct misdn_bchannel *bc) 
{
   
   chan_misdn_log(2, bc->port, " --> Bearer: %s\n",bearer2str(bc->capability));
   
   switch(bc->law) {
   case INFO_CODEC_ALAW:
      chan_misdn_log(2, bc->port, " --> Codec: Alaw\n");
      break;
   case INFO_CODEC_ULAW:
      chan_misdn_log(2, bc->port, " --> Codec: Ulaw\n");
      break;
   }
}

static void export_aoc_vars(int originator, struct ast_channel *ast, struct misdn_bchannel *bc)
{
   char buf[128];

   if (!ast)
      return;

   if (originator == ORG_AST) {
      ast = ast_bridged_channel(ast);
      if (!ast)
         return;
   }

   switch (bc->AOCDtype) {
   case Fac_AOCDCurrency:
      pbx_builtin_setvar_helper(ast, "AOCD_Type", "currency");
      if (bc->AOCD.currency.chargeNotAvailable)
         pbx_builtin_setvar_helper(ast, "AOCD_ChargeAvailable", "no");
      else {
         pbx_builtin_setvar_helper(ast, "AOCD_ChargeAvailable", "yes");
         if (bc->AOCD.currency.freeOfCharge)
            pbx_builtin_setvar_helper(ast, "AOCD_FreeOfCharge", "yes");
         else {
            pbx_builtin_setvar_helper(ast, "AOCD_FreeOfCharge", "no");
            if (snprintf(buf, sizeof(buf), "%d %s", bc->AOCD.currency.currencyAmount * bc->AOCD.currency.multiplier, bc->AOCD.currency.currency) < sizeof(buf)) {
               pbx_builtin_setvar_helper(ast, "AOCD_Amount", buf);
               if (bc->AOCD.currency.billingId >= 0 && snprintf(buf, sizeof(buf), "%d", bc->AOCD.currency.billingId) < sizeof(buf))
                  pbx_builtin_setvar_helper(ast, "AOCD_BillingId", buf);
            }
         }
      }
      break;
   case Fac_AOCDChargingUnit:
      pbx_builtin_setvar_helper(ast, "AOCD_Type", "charging_unit");
      if (bc->AOCD.chargingUnit.chargeNotAvailable)
         pbx_builtin_setvar_helper(ast, "AOCD_ChargeAvailable", "no");
      else {
         pbx_builtin_setvar_helper(ast, "AOCD_ChargeAvailable", "yes");
         if (bc->AOCD.chargingUnit.freeOfCharge)
            pbx_builtin_setvar_helper(ast, "AOCD_FreeOfCharge", "yes");
         else {
            pbx_builtin_setvar_helper(ast, "AOCD_FreeOfCharge", "no");
            if (snprintf(buf, sizeof(buf), "%d", bc->AOCD.chargingUnit.recordedUnits) < sizeof(buf)) {
               pbx_builtin_setvar_helper(ast, "AOCD_RecordedUnits", buf);
               if (bc->AOCD.chargingUnit.billingId >= 0 && snprintf(buf, sizeof(buf), "%d", bc->AOCD.chargingUnit.billingId) < sizeof(buf))
                  pbx_builtin_setvar_helper(ast, "AOCD_BillingId", buf);
            }
         }
      }
      break;
   default:
      break;
   }
}

/*************** Helpers END *************/

static void sighandler(int sig)
{}

static void* misdn_tasks_thread_func (void *data)
{
   int wait;
   struct sigaction sa;

   sa.sa_handler = sighandler;
   sa.sa_flags = SA_NODEFER;
   sigemptyset(&sa.sa_mask);
   sigaddset(&sa.sa_mask, SIGUSR1);
   sigaction(SIGUSR1, &sa, NULL);
   
   sem_post((sem_t *)data);

   while (1) {
      wait = ast_sched_wait(misdn_tasks);
      if (wait < 0)
         wait = 8000;
      if (poll(NULL, 0, wait) < 0)
         chan_misdn_log(4, 0, "Waking up misdn_tasks thread\n");
      ast_sched_runq(misdn_tasks);
   }
   return NULL;
}

static void misdn_tasks_init (void)
{
   sem_t blocker;
   int i = 5;

   if (sem_init(&blocker, 0, 0)) {
      perror("chan_misdn: Failed to initialize semaphore!");
      exit(1);
   }

   chan_misdn_log(4, 0, "Starting misdn_tasks thread\n");
   
   misdn_tasks = sched_context_create();
   pthread_create(&misdn_tasks_thread, NULL, misdn_tasks_thread_func, &blocker);

   while (sem_wait(&blocker) && --i);
   sem_destroy(&blocker);
}

static void misdn_tasks_destroy (void)
{
   if (misdn_tasks) {
      chan_misdn_log(4, 0, "Killing misdn_tasks thread\n");
      if ( pthread_cancel(misdn_tasks_thread) == 0 ) {
         cb_log(4, 0, "Joining misdn_tasks thread\n");
         pthread_join(misdn_tasks_thread, NULL);
      }
      sched_context_destroy(misdn_tasks);
   }
}

static inline void misdn_tasks_wakeup (void)
{
   pthread_kill(misdn_tasks_thread, SIGUSR1);
}

static inline int _misdn_tasks_add_variable (int timeout, ast_sched_cb callback, const void *data, int variable)
{
   int task_id;

   if (!misdn_tasks) {
      misdn_tasks_init();
   }
   task_id = ast_sched_add_variable(misdn_tasks, timeout, callback, data, variable);
   misdn_tasks_wakeup();

   return task_id;
}

static int misdn_tasks_add (int timeout, ast_sched_cb callback, const void *data)
{
   return _misdn_tasks_add_variable(timeout, callback, data, 0);
}

static int misdn_tasks_add_variable (int timeout, ast_sched_cb callback, const void *data)
{
   return _misdn_tasks_add_variable(timeout, callback, data, 1);
}

static void misdn_tasks_remove (int task_id)
{
   AST_SCHED_DEL(misdn_tasks, task_id);
}

static int misdn_l1_task (const void *data)
{
   misdn_lib_isdn_l1watcher(*(int *)data);
   chan_misdn_log(5, *(int *)data, "L1watcher timeout\n");
   return 1;
}

static int misdn_overlap_dial_task (const void *data)
{
   struct timeval tv_end, tv_now;
   int diff;
   struct chan_list *ch = (struct chan_list *)data;

   chan_misdn_log(4, ch->bc->port, "overlap dial task, chan_state: %d\n", ch->state);

   if (ch->state != MISDN_WAITING4DIGS) {
      ch->overlap_dial_task = -1;
      return 0;
   }
   
   ast_mutex_lock(&ch->overlap_tv_lock);
   tv_end = ch->overlap_tv;
   ast_mutex_unlock(&ch->overlap_tv_lock);
   
   tv_end.tv_sec += ch->overlap_dial;
   tv_now = ast_tvnow();

   diff = ast_tvdiff_ms(tv_end, tv_now);

   if (diff <= 100) {
      char *dad=ch->bc->dad, sexten[]="s";
      /* if we are 100ms near the timeout, we are satisfied.. */
      stop_indicate(ch);
      
      if (ast_strlen_zero(ch->bc->dad)) {
         dad=sexten;
         strcpy(ch->ast->exten, sexten);
      }

      if (ast_exists_extension(ch->ast, ch->context, dad, 1, ch->bc->oad)) {
         ch->state=MISDN_DIALING;
         if (pbx_start_chan(ch) < 0) {
            chan_misdn_log(-1, ch->bc->port, "ast_pbx_start returned < 0 in misdn_overlap_dial_task\n");
            goto misdn_overlap_dial_task_disconnect;
         }
      } else {
misdn_overlap_dial_task_disconnect:
         hanguptone_indicate(ch);
         ch->bc->out_cause = AST_CAUSE_UNALLOCATED;
         ch->state=MISDN_CLEANING;
         misdn_lib_send_event(ch->bc, EVENT_DISCONNECT);
      }
      ch->overlap_dial_task = -1;
      return 0;
   } else
      return diff;
}

static void send_digit_to_chan(struct chan_list *cl, char digit )
{
   static const char* dtmf_tones[] = {
      "!941+1336/100,!0/100", /* 0 */
      "!697+1209/100,!0/100", /* 1 */
      "!697+1336/100,!0/100", /* 2 */
      "!697+1477/100,!0/100", /* 3 */
      "!770+1209/100,!0/100", /* 4 */
      "!770+1336/100,!0/100", /* 5 */
      "!770+1477/100,!0/100", /* 6 */
      "!852+1209/100,!0/100", /* 7 */
      "!852+1336/100,!0/100", /* 8 */
      "!852+1477/100,!0/100", /* 9 */
      "!697+1633/100,!0/100", /* A */
      "!770+1633/100,!0/100", /* B */
      "!852+1633/100,!0/100", /* C */
      "!941+1633/100,!0/100", /* D */
      "!941+1209/100,!0/100", /* * */
      "!941+1477/100,!0/100" };  /* # */
   struct ast_channel *chan=cl->ast; 
  
   if (digit >= '0' && digit <='9')
      ast_playtones_start(chan,0,dtmf_tones[digit-'0'], 0);
   else if (digit >= 'A' && digit <= 'D')
      ast_playtones_start(chan,0,dtmf_tones[digit-'A'+10], 0);
   else if (digit == '*')
      ast_playtones_start(chan,0,dtmf_tones[14], 0);
   else if (digit == '#')
      ast_playtones_start(chan,0,dtmf_tones[15], 0);
   else {
      /* not handled */
      ast_log(LOG_DEBUG, "Unable to handle DTMF tone '%c' for '%s'\n", digit, chan->name);
   }
}

/*** CLI HANDLING ***/
static int misdn_set_debug(int fd, int argc, char *argv[])
{
   int level;

   if (argc != 4 && argc != 5 && argc != 6 && argc != 7)
      return RESULT_SHOWUSAGE; 

   level = atoi(argv[3]);

   switch (argc) {
   case 4:
   case 5:
      {
         int i;
         int only = 0;
         if (argc == 5) {
            if (strncasecmp(argv[4], "only", strlen(argv[4])))
               return RESULT_SHOWUSAGE;
            else
               only = 1;
         }
   
         for (i = 0; i <= max_ports; i++) {
            misdn_debug[i] = level;
            misdn_debug_only[i] = only;
         }
         ast_cli(fd, "changing debug level for all ports to %d%s\n",misdn_debug[0], only?" (only)":"");
      }
      break;
   case 6:
   case 7:
      {
         int port;
         if (strncasecmp(argv[4], "port", strlen(argv[4])))
            return RESULT_SHOWUSAGE;
         port = atoi(argv[5]);
         if (port <= 0 || port > max_ports) {
            switch (max_ports) {
            case 0:
               ast_cli(fd, "port number not valid! no ports available so you won't get lucky with any number here...\n");
               break;
            case 1:
               ast_cli(fd, "port number not valid! only port 1 is available.\n");
               break;
            default:
               ast_cli(fd, "port number not valid! only ports 1 to %d are available.\n", max_ports);
            }
            return 0;
         }
         if (argc == 7) {
            if (strncasecmp(argv[6], "only", strlen(argv[6])))
               return RESULT_SHOWUSAGE;
            else
               misdn_debug_only[port] = 1;
         } else
            misdn_debug_only[port] = 0;
         misdn_debug[port] = level;
         ast_cli(fd, "changing debug level to %d%s for port %d\n", misdn_debug[port], misdn_debug_only[port]?" (only)":"", port);
      }
   }
   return 0;
}

static int misdn_set_crypt_debug(int fd, int argc, char *argv[])
{
   if (argc != 5) return RESULT_SHOWUSAGE; 

   return 0;
}

static int misdn_port_block(int fd, int argc, char *argv[])
{
   int port;

   if (argc != 4)
      return RESULT_SHOWUSAGE;
  
   port = atoi(argv[3]);

   misdn_lib_port_block(port);

   return 0;
}

static int misdn_port_unblock(int fd, int argc, char *argv[])
{
   int port;
  
   if (argc != 4)
      return RESULT_SHOWUSAGE;
  
   port = atoi(argv[3]);

   misdn_lib_port_unblock(port);

   return 0;
}


static int misdn_restart_port (int fd, int argc, char *argv[])
{
   int port;
  
   if (argc != 4)
      return RESULT_SHOWUSAGE;
  
   port = atoi(argv[3]);

   misdn_lib_port_restart(port);

   return 0;
}

static int misdn_restart_pid (int fd, int argc, char *argv[])
{
   int pid;
  
   if (argc != 4)
      return RESULT_SHOWUSAGE;
  
   pid = atoi(argv[3]);

   misdn_lib_pid_restart(pid);

   return 0;
}

static int misdn_port_up (int fd, int argc, char *argv[])
{
   int port;
   
   if (argc != 4)
      return RESULT_SHOWUSAGE;
   
   port = atoi(argv[3]);
   
   misdn_lib_get_port_up(port);
  
   return 0;
}

static int misdn_port_down (int fd, int argc, char *argv[])
{
   int port;

   if (argc != 4)
      return RESULT_SHOWUSAGE;
   
   port = atoi(argv[3]);
   
   misdn_lib_get_port_down(port);
  
   return 0;
}

static inline void show_config_description (int fd, enum misdn_cfg_elements elem)
{
   char section[BUFFERSIZE];
   char name[BUFFERSIZE];
   char desc[BUFFERSIZE];
   char def[BUFFERSIZE];
   char tmp[BUFFERSIZE];

   misdn_cfg_get_name(elem, tmp, sizeof(tmp));
   term_color(name, tmp, COLOR_BRWHITE, 0, sizeof(tmp));
   misdn_cfg_get_desc(elem, desc, sizeof(desc), def, sizeof(def));

   if (elem < MISDN_CFG_LAST)
      term_color(section, "PORTS SECTION", COLOR_YELLOW, 0, sizeof(section));
   else
      term_color(section, "GENERAL SECTION", COLOR_YELLOW, 0, sizeof(section));

   if (*def)
      ast_cli(fd, "[%s] %s   (Default: %s)\n\t%s\n", section, name, def, desc);
   else
      ast_cli(fd, "[%s] %s\n\t%s\n", section, name, desc);
}

static int misdn_show_config (int fd, int argc, char *argv[])
{
   char buffer[BUFFERSIZE];
   enum misdn_cfg_elements elem;
   int linebreak;
   int onlyport = -1;
   int ok = 0;

   if (argc >= 4) {
      if (!strcmp(argv[3], "description")) {
         if (argc == 5) {
            enum misdn_cfg_elements elem = misdn_cfg_get_elem(argv[4]);
            if (elem == MISDN_CFG_FIRST)
               ast_cli(fd, "Unknown element: %s\n", argv[4]);
            else
               show_config_description(fd, elem);
            return 0;
         }
         return RESULT_SHOWUSAGE;
      }
      if (!strcmp(argv[3], "descriptions")) {
         if ((argc == 4) || ((argc == 5) && !strcmp(argv[4], "general"))) {
            for (elem = MISDN_GEN_FIRST + 1; elem < MISDN_GEN_LAST; ++elem) {
               show_config_description(fd, elem);
               ast_cli(fd, "\n");
            }
            ok = 1;
         }
         if ((argc == 4) || ((argc == 5) && !strcmp(argv[4], "ports"))) {
            for (elem = MISDN_CFG_FIRST + 1; elem < MISDN_CFG_LAST - 1 /* the ptp hack, remove the -1 when ptp is gone */; ++elem) {
               show_config_description(fd, elem);
               ast_cli(fd, "\n");
            }
            ok = 1;
         }
         return ok ? 0 : RESULT_SHOWUSAGE;
      }
      if (!sscanf(argv[3], "%30d", &onlyport) || onlyport < 0) {
         ast_cli(fd, "Unknown option: %s\n", argv[3]);
         return RESULT_SHOWUSAGE;
      }
   }
   
   if (argc == 3 || onlyport == 0) {
      ast_cli(fd, "Misdn General-Config:\n");
      for (elem = MISDN_GEN_FIRST + 1, linebreak = 1; elem < MISDN_GEN_LAST; elem++, linebreak++) {
         misdn_cfg_get_config_string(0, elem, buffer, BUFFERSIZE);
         ast_cli(fd, "%-36s%s", buffer, !(linebreak % 2) ? "\n" : "");
      }
      ast_cli(fd, "\n");
   }

   if (onlyport < 0) {
      int port = misdn_cfg_get_next_port(0);
      for (; port > 0; port = misdn_cfg_get_next_port(port)) {
         ast_cli(fd, "\n[PORT %d]\n", port);
         for (elem = MISDN_CFG_FIRST + 1, linebreak = 1; elem < MISDN_CFG_LAST; elem++, linebreak++) {
            misdn_cfg_get_config_string(port, elem, buffer, BUFFERSIZE);
            ast_cli(fd, "%-36s%s", buffer, !(linebreak % 2) ? "\n" : "");
         }  
         ast_cli(fd, "\n");
      }
   }
   
   if (onlyport > 0) {
      if (misdn_cfg_is_port_valid(onlyport)) {
         ast_cli(fd, "[PORT %d]\n", onlyport);
         for (elem = MISDN_CFG_FIRST + 1, linebreak = 1; elem < MISDN_CFG_LAST; elem++, linebreak++) {
            misdn_cfg_get_config_string(onlyport, elem, buffer, BUFFERSIZE);
            ast_cli(fd, "%-36s%s", buffer, !(linebreak % 2) ? "\n" : "");
         }  
         ast_cli(fd, "\n");
      } else {
         ast_cli(fd, "Port %d is not active!\n", onlyport);
      }
   }

   return 0;
}

struct state_struct {
   enum misdn_chan_state state;
   char txt[255];
};

static struct state_struct state_array[] = {
   {MISDN_NOTHING,"NOTHING"}, /* at beginning */
   {MISDN_WAITING4DIGS,"WAITING4DIGS"}, /*  when waiting for infos */
   {MISDN_EXTCANTMATCH,"EXTCANTMATCH"}, /*  when asterisk couldn't match our ext */
   {MISDN_INCOMING_SETUP,"INCOMING SETUP"}, /*  when pbx_start */
   {MISDN_DIALING,"DIALING"}, /*  when pbx_start */
   {MISDN_PROGRESS,"PROGRESS"}, /*  when pbx_start */
   {MISDN_PROCEEDING,"PROCEEDING"}, /*  when pbx_start */
   {MISDN_CALLING,"CALLING"}, /*  when misdn_call is called */
   {MISDN_CALLING_ACKNOWLEDGE,"CALLING_ACKNOWLEDGE"}, /*  when misdn_call is called */
   {MISDN_ALERTING,"ALERTING"}, /*  when Alerting */
   {MISDN_BUSY,"BUSY"}, /*  when BUSY */
   {MISDN_CONNECTED,"CONNECTED"}, /*  when connected */
   {MISDN_DISCONNECTED,"DISCONNECTED"}, /*  when connected */
   {MISDN_CLEANING,"CLEANING"}, /* when hangup from * but we were connected before */
};

static const char *misdn_get_ch_state(struct chan_list *p) 
{
   int i;
   static char state[8];
   
   if( !p) return NULL;
  
   for (i = 0; i < sizeof(state_array) / sizeof(struct state_struct); i++) {
      if (state_array[i].state == p->state)
         return state_array[i].txt; 
   }

   snprintf(state, sizeof(state), "%d", p->state) ;

   return state;
}



static void reload_config(void)
{
   int i, cfg_debug;

   if (!g_config_initialized) {
      ast_log(LOG_WARNING, "chan_misdn is not initialized properly, still reloading ?\n");
      return ;
   }
   
   free_robin_list();
   misdn_cfg_reload();
   misdn_cfg_update_ptp();
   misdn_cfg_get(0, MISDN_GEN_TRACEFILE, global_tracefile, BUFFERSIZE);
   misdn_cfg_get(0, MISDN_GEN_DEBUG, &cfg_debug, sizeof(int));

   for (i = 0;  i <= max_ports; i++) {
      misdn_debug[i] = cfg_debug;
      misdn_debug_only[i] = 0;
   }
}

static int misdn_reload (int fd, int argc, char *argv[])
{
   ast_cli(fd, "Reloading mISDN configuration\n");
   reload_config();
   return 0;
}

static void print_bc_info (int fd, struct chan_list *help, struct misdn_bchannel *bc)
{
   struct ast_channel *ast = help->ast;
   ast_cli(fd,
      "* Pid:%d Prt:%d Ch:%d Mode:%s Org:%s dad:%s oad:%s rad:%s ctx:%s state:%s\n",

      bc->pid, bc->port, bc->channel,
      bc->nt ? "NT" : "TE",
      help->originator == ORG_AST ? "*" : "I",
      ast ? ast->exten : NULL,
      ast ? ast->cid.cid_num : NULL,
      bc->rad,
      ast ? ast->context : NULL,
      misdn_get_ch_state(help)
      );
   if (misdn_debug[bc->port] > 0)
      ast_cli(fd,
         "  --> astname: %s\n"
         "  --> ch_l3id: %x\n"
         "  --> ch_addr: %x\n"
         "  --> bc_addr: %x\n"
         "  --> bc_l3id: %x\n"
         "  --> display: %s\n"
         "  --> activated: %d\n"
         "  --> state: %s\n"
         "  --> capability: %s\n"
#ifdef MISDN_1_2
         "  --> pipeline: %s\n"
#else
         "  --> echo_cancel: %d\n"
#endif
         "  --> notone : rx %d tx:%d\n"
         "  --> bc_hold: %d\n",
         help->ast->name,
         help->l3id,
         help->addr,
         bc->addr,
         bc ? bc->l3_id : -1,
         bc->display,
         
         bc->active,
         bc_state2str(bc->bc_state),
         bearer2str(bc->capability),
#ifdef MISDN_1_2
         bc->pipeline,
#else
         bc->ec_enable,
#endif

         help->norxtone, help->notxtone,
         bc->holded
         );

}

static int misdn_show_cls (int fd, int argc, char *argv[])
{
   struct chan_list *help;

   help = cl_te;
  
   ast_cli(fd, "Channel List: %p\n", cl_te);

   for (; help; help = help->next) {
      struct misdn_bchannel *bc = help->bc;   
      struct ast_channel *ast = help->ast;
      if (!ast) {
         if (!bc) {
            ast_cli(fd, "chan_list obj. with l3id:%x has no bc and no ast Leg\n", help->l3id);
            continue;
         }
         ast_cli(fd, "bc with pid:%d has no Ast Leg\n", bc->pid);
         continue;
      }

      if (misdn_debug[0] > 2)
         ast_cli(fd, "Bc:%p Ast:%p\n", bc, ast);
      if (bc) {
         print_bc_info(fd, help, bc);
      } else {
         if (help->hold.state != MISDN_HOLD_IDLE) {
            ast_cli(fd, "ITS A HELD CALL BC:\n");
            ast_cli(fd, " --> l3_id: %x\n"
                  " --> dad:%s oad:%s\n"
                  " --> hold_port: %d\n"
                  " --> hold_channel: %d\n",
                  help->l3id,
                  ast->exten,
                  ast->cid.cid_num,
                  help->hold.port,
                  help->hold.channel
                  );
         } else {
            ast_cli(fd, "* Channel in unknown STATE !!! Exten:%s, Callerid:%s\n", ast->exten, ast->cid.cid_num);
         }
      }
   }

   misdn_dump_chanlist();

   return 0;
}

static int misdn_show_cl (int fd, int argc, char *argv[])
{
   struct chan_list *help;

   if (argc != 4)
      return RESULT_SHOWUSAGE;

   help = cl_te;

   for (; help; help = help->next) {
      struct misdn_bchannel *bc = help->bc;   
      struct ast_channel *ast = help->ast;
    
      if (bc && ast) {
         if (!strcasecmp(ast->name,argv[3])) {
            print_bc_info(fd, help, bc);
            break; 
         }
      } 
   }

   return 0;
}

ast_mutex_t lock;
int MAXTICS = 8;

static int misdn_set_tics (int fd, int argc, char *argv[])
{
   if (argc != 4)
      return RESULT_SHOWUSAGE;

   MAXTICS = atoi(argv[3]);

   return 0;
}

static int misdn_show_stacks (int fd, int argc, char *argv[])
{
   int port;

   ast_cli(fd, "BEGIN STACK_LIST:\n");
   for (port = misdn_cfg_get_next_port(0); port > 0;
        port = misdn_cfg_get_next_port(port)) {
      char buf[128];
      get_show_stack_details(port, buf);
      ast_cli(fd, "  %s  Debug:%d%s\n", buf, misdn_debug[port], misdn_debug_only[port] ? "(only)" : "");
   }

   return 0;
}

static int misdn_show_ports_stats (int fd, int argc, char *argv[])
{
   int port;

   ast_cli(fd, "Port\tin_calls\tout_calls\n");
   for (port = misdn_cfg_get_next_port(0); port > 0;
        port = misdn_cfg_get_next_port(port)) {
      ast_cli(fd, "%d\t%d\t\t%d\n", port, misdn_in_calls[port], misdn_out_calls[port]);
   }
   ast_cli(fd, "\n");

   return 0;
}

static int misdn_show_port (int fd, int argc, char *argv[])
{
   int port;
   char buf[128];

   if (argc != 4)
      return RESULT_SHOWUSAGE;

   port = atoi(argv[3]);
  
   ast_cli(fd, "BEGIN STACK_LIST:\n");
   get_show_stack_details(port, buf);
   ast_cli(fd, "  %s  Debug:%d%s\n", buf, misdn_debug[port], misdn_debug_only[port] ? "(only)" : "");

   return 0;
}

static int misdn_send_cd (int fd, int argc, char *argv[])
{
   char *channame; 
   char *nr;
   struct chan_list *tmp;

   if (argc != 5)
      return RESULT_SHOWUSAGE;
 
   
   {
      channame = argv[3];
      nr = argv[4];

      ast_cli(fd, "Sending Calldeflection (%s) to %s\n", nr, channame);
      tmp = get_chan_by_ast_name(channame);
      if (!tmp) {
         ast_cli(fd, "Sending CD with nr %s to %s failed: Channel does not exist.\n",nr, channame);
         return 0; 
      }

      if (strlen(nr) >= 15) {
         ast_cli(fd, "Sending CD with nr %s to %s failed: Number too long (up to 15 digits are allowed).\n",nr, channame);
         return 0; 
      }
      tmp->bc->fac_out.Function = Fac_CD;
      ast_copy_string((char *)tmp->bc->fac_out.u.CDeflection.DeflectedToNumber, nr, sizeof(tmp->bc->fac_out.u.CDeflection.DeflectedToNumber));
      misdn_lib_send_event(tmp->bc, EVENT_FACILITY);
   }

   return 0;
}

static int misdn_send_restart(int fd, int argc, char *argv[])
{
   int port;
   int channel;

   if (argc < 4 || argc > 5)
      return RESULT_SHOWUSAGE;

   port = atoi(argv[3]);

   if (argc == 5) {
      channel = atoi(argv[4]);
      misdn_lib_send_restart(port, channel);
   } else {
      misdn_lib_send_restart(port, -1);
   }

   return 0;
}

static int misdn_send_digit (int fd, int argc, char *argv[])
{
   char *channame; 
   char *msg; 
   struct chan_list *tmp;
   int i, msglen;

   if (argc != 5)
      return RESULT_SHOWUSAGE;

   channame = argv[3];
   msg = argv[4];
   msglen = strlen(msg);

   ast_cli(fd, "Sending %s to %s\n", msg, channame);

   tmp = get_chan_by_ast_name(channame);
   if (!tmp) {
      ast_cli(fd, "Sending %s to %s failed Channel does not exist\n", msg, channame);
      return 0; 
   }
#if 1
   for (i = 0; i < msglen; i++) {
      ast_cli(fd, "Sending: %c\n", msg[i]);
      send_digit_to_chan(tmp, msg[i]);
      /* res = ast_safe_sleep(tmp->ast, 250); */
      usleep(250000);
      /* res = ast_waitfor(tmp->ast,100); */
   }
#else
   ast_dtmf_stream(tmp->ast, NULL, msg, 250);
#endif

   return 0;
}

static int misdn_toggle_echocancel (int fd, int argc, char *argv[])
{
   char *channame;
   struct chan_list *tmp;

   if (argc != 4)
      return RESULT_SHOWUSAGE;

   channame = argv[3];
  
   ast_cli(fd, "Toggling EchoCancel on %s\n", channame);
  
   tmp = get_chan_by_ast_name(channame);
   if (!tmp) {
      ast_cli(fd, "Toggling EchoCancel %s failed Channel does not exist\n", channame);
      return 0;
   }

   tmp->toggle_ec = tmp->toggle_ec ? 0 : 1;

   if (tmp->toggle_ec) {
#ifdef MISDN_1_2
      update_pipeline_config(tmp->bc);
#else
      update_ec_config(tmp->bc);
#endif
      manager_ec_enable(tmp->bc);
   } else {
      manager_ec_disable(tmp->bc);
   }

   return 0;
}

static int misdn_send_display (int fd, int argc, char *argv[])
{
   char *channame;
   char *msg;
   struct chan_list *tmp;

   if (argc != 5)
      return RESULT_SHOWUSAGE;

   channame = argv[3];
   msg = argv[4];

   ast_cli(fd, "Sending %s to %s\n", msg, channame);
   tmp = get_chan_by_ast_name(channame);
    
   if (tmp && tmp->bc) {
      ast_copy_string(tmp->bc->display, msg, sizeof(tmp->bc->display));
      misdn_lib_send_event(tmp->bc, EVENT_INFORMATION);
   } else {
      ast_cli(fd, "No such channel %s\n", channame);
      return RESULT_FAILURE;
   }

   return RESULT_SUCCESS;
}

static char *complete_ch_helper(const char *line, const char *word, int pos, int state, int rpos)
{
   struct ast_channel *c;
   int which=0;
   char *ret;
   if (pos != rpos)
      return NULL;
   c = ast_channel_walk_locked(NULL);
   while(c) {
      if (!strncasecmp(word, c->name, strlen(word))) {
         if (++which > state)
            break;
      }
      ast_mutex_unlock(&c->lock);
      c = ast_channel_walk_locked(c);
   }
   if (c) {
      ret = strdup(c->name);
      ast_mutex_unlock(&c->lock);
   } else
      ret = NULL;
   return ret;
}

static char *complete_ch(const char *line, const char *word, int pos, int state)
{
   return complete_ch_helper(line, word, pos, state, 3);
}

static char *complete_debug_port (const char *line, const char *word, int pos, int state)
{
   if (state)
      return NULL;

   switch (pos) {
   case 4:
      if (*word == 'p')
         return strdup("port");
      else if (*word == 'o')
         return strdup("only");
      break;
   case 6:
      if (*word == 'o')
         return strdup("only");
      break;
   }
   return NULL;
}

static char *complete_show_config (const char *line, const char *word, int pos, int state)
{
   char buffer[BUFFERSIZE];
   enum misdn_cfg_elements elem;
   int wordlen = strlen(word);
   int which = 0;
   int port = 0;

   switch (pos) {
   case 3:
      if ((!strncmp(word, "description", wordlen)) && (++which > state))
         return strdup("description");
      if ((!strncmp(word, "descriptions", wordlen)) && (++which > state))
         return strdup("descriptions");
      if ((!strncmp(word, "0", wordlen)) && (++which > state))
         return strdup("0");
      while ((port = misdn_cfg_get_next_port(port)) != -1) {
         snprintf(buffer, sizeof(buffer), "%d", port);
         if ((!strncmp(word, buffer, wordlen)) && (++which > state)) {
            return strdup(buffer);
         }
      }
      break;
   case 4:
      if (strstr(line, "description ")) {
         for (elem = MISDN_CFG_FIRST + 1; elem < MISDN_GEN_LAST; ++elem) {
            if ((elem == MISDN_CFG_LAST) || (elem == MISDN_GEN_FIRST))
               continue;
            misdn_cfg_get_name(elem, buffer, BUFFERSIZE);
            if (!wordlen || !strncmp(word, buffer, wordlen)) {
               if (++which > state)
                  return strdup(buffer);
            }
         }
      } else if (strstr(line, "descriptions ")) {
         if ((!wordlen || !strncmp(word, "general", wordlen)) && (++which > state))
            return strdup("general");
         if ((!wordlen || !strncmp(word, "ports", wordlen)) && (++which > state))
            return strdup("ports");
      }
      break;
   }
   return NULL;
}

static struct ast_cli_entry chan_misdn_clis[] = {
   { {"misdn","send","calldeflect", NULL}, misdn_send_cd, "Sends CallDeflection to mISDN Channel",
      "Usage: misdn send calldeflect <channel> \"<nr>\" \n", complete_ch },
   { {"misdn","send","digit", NULL}, misdn_send_digit,   "Sends DTMF Digit to mISDN Channel",
      "Usage: misdn send digit <channel> \"<msg>\" \n"
      "       Send <digit> to <channel> as DTMF Tone\n"
      "       when channel is a mISDN channel\n", complete_ch },
   { {"misdn","toggle","echocancel", NULL}, misdn_toggle_echocancel, "Toggles EchoCancel on mISDN Channel",
      "Usage: misdn toggle echocancel <channel>\n", complete_ch },
   { {"misdn","send","display", NULL}, misdn_send_display, "Sends Text to mISDN Channel", 
      "Usage: misdn send display <channel> \"<msg>\" \n"
      "       Send <msg> to <channel> as Display Message\n"
      "       when channel is a mISDN channel\n", complete_ch },
   { {"misdn","show","config", NULL}, misdn_show_config, "Shows internal mISDN config, read from cfg-file",
      "Usage: misdn show config [<port> | description <config element> | descriptions [general|ports]]\n"
      "       Use 0 for <port> to only print the general config.\n", complete_show_config },
   { {"misdn","reload", NULL}, misdn_reload, "Reloads internal mISDN config, read from cfg-file",
      "Usage: misdn reload\n" },
   { {"misdn","set","tics", NULL}, misdn_set_tics, "", 
      "\n" },
   { {"misdn","show","channels", NULL}, misdn_show_cls, "Shows internal mISDN chan_list",
      "Usage: misdn show channels\n" },
   { {"misdn","show","channel", NULL}, misdn_show_cl, "Shows internal mISDN chan_list",
      "Usage: misdn show channels\n", complete_ch },
   { {"misdn","port","block", NULL}, misdn_port_block, "Blocks the given port",
      "Usage: misdn port block\n" },
   { {"misdn","port","unblock", NULL}, misdn_port_unblock, "Unblocks the given port",
      "Usage: misdn port unblock\n" },
   { {"misdn","restart","port", NULL}, misdn_restart_port, "Restarts the given port",
      "Usage: misdn restart port\n" },
   { {"misdn","restart","pid", NULL}, misdn_restart_pid, "Restarts the given pid",
      "Usage: misdn restart pid\n" },
   { {"misdn","send","restart", NULL},  misdn_send_restart, 
     "Sends a restart for every bchannel on the given port", 
     "Usage: misdn send restart <port>\n"},
   { {"misdn","port","up", NULL}, misdn_port_up, "Tries to establish L1 on the given port",
      "Usage: misdn port up <port>\n" },
   { {"misdn","port","down", NULL}, misdn_port_down, "Tries to deactivate the L1 on the given port",
      "Usage: misdn port down <port>\n" },
   { {"misdn","show","stacks", NULL}, misdn_show_stacks, "Shows internal mISDN stack_list",
      "Usage: misdn show stacks\n" },
   { {"misdn","show","ports","stats", NULL}, misdn_show_ports_stats, "Shows chan_misdns call statistics per port",
      "Usage: misdn show port stats\n" },
   { {"misdn","show","port", NULL}, misdn_show_port, "Shows detailed information for given port",
      "Usage: misdn show port <port>\n" },
   { {"misdn","set","debug", NULL}, misdn_set_debug, "Sets Debuglevel of chan_misdn",
      "Usage: misdn set debug <level> [only] | [port <port> [only]]\n", complete_debug_port },
   { {"misdn","set","crypt","debug", NULL}, misdn_set_crypt_debug, "Sets CryptDebuglevel of chan_misdn, at the moment, level={1,2}",
      "Usage: misdn set crypt debug <level>\n" }
};

/*! \brief Updates caller ID information from config */
static int update_config(struct chan_list *ch, int orig) 
{
   struct ast_channel *ast;
   struct misdn_bchannel *bc;
   int port, hdlc = 0;
   int pres, screen;

   if (!ch) {
      ast_log(LOG_WARNING, "Cannot configure without chanlist\n");
      return -1;
   }

   ast = ch->ast;
   bc = ch->bc;
   if (! ast || ! bc) {
      ast_log(LOG_WARNING, "Cannot configure without ast || bc\n");
      return -1;
   }

   port = bc->port;

   chan_misdn_log(7, port, "update_config: Getting Config\n");

   misdn_cfg_get(port, MISDN_CFG_HDLC, &hdlc, sizeof(int));
   
   if (hdlc) {
      switch (bc->capability) {
      case INFO_CAPABILITY_DIGITAL_UNRESTRICTED:
      case INFO_CAPABILITY_DIGITAL_RESTRICTED:
         chan_misdn_log(1, bc->port, " --> CONF HDLC\n");
         bc->hdlc = 1;
         break;
      }
   }


   misdn_cfg_get(port, MISDN_CFG_PRES, &pres, sizeof(pres));
   misdn_cfg_get(port, MISDN_CFG_SCREEN, &screen, sizeof(screen));
   chan_misdn_log(2, port, " --> pres: %d screen: %d\n", pres, screen);
      
   if (pres < 0 || screen < 0) {
      chan_misdn_log(2, port, " --> pres: %x\n", ast->cid.cid_pres);
         
      switch (ast->cid.cid_pres & 0x60) {
      case AST_PRES_RESTRICTED:
         bc->pres = 1;
         chan_misdn_log(2, port, " --> PRES: Restricted (1)\n");
         break;
      case AST_PRES_UNAVAILABLE:
         bc->pres = 2;
         chan_misdn_log(2, port, " --> PRES: Unavailable (2)\n");
         break;
      default:
         bc->pres = 0;
         chan_misdn_log(2, port, " --> PRES: Allowed (0)\n");
         break;
      }

      switch (ast->cid.cid_pres & 0x3) {
      default:
      case AST_PRES_USER_NUMBER_UNSCREENED:
         bc->screen = 0;
         chan_misdn_log(2, port, " --> SCREEN: Unscreened (0)\n");
         break;
      case AST_PRES_USER_NUMBER_PASSED_SCREEN:
         bc->screen = 1;
         chan_misdn_log(2, port, " --> SCREEN: Passed Screen (1)\n");
         break;
      case AST_PRES_USER_NUMBER_FAILED_SCREEN:
         bc->screen = 2;
         chan_misdn_log(2, port, " --> SCREEN: Failed Screen (2)\n");
         break;
      case AST_PRES_NETWORK_NUMBER:
         bc->screen = 3;
         chan_misdn_log(2, port, " --> SCREEN: Network Nr. (3)\n");
         break;
      }
   } else {
      bc->screen = screen;
      bc->pres = pres;
   }

   return 0;
}


static void config_jitterbuffer(struct chan_list *ch)
{
   struct misdn_bchannel *bc = ch->bc;
   int len = ch->jb_len, threshold = ch->jb_upper_threshold;
   
   chan_misdn_log(5, bc->port, "config_jb: Called\n");
   
   if (! len) {
      chan_misdn_log(1, bc->port, "config_jb: Deactivating Jitterbuffer\n");
      bc->nojitter=1;
   } else {
      if (len <= 100 || len > 8000) {
         chan_misdn_log(0, bc->port, "config_jb: Jitterbuffer out of Bounds, setting to 1000\n");
         len = 1000;
      }

      if ( threshold > len ) {
         chan_misdn_log(0, bc->port, "config_jb: Jitterbuffer Threshold > Jitterbuffer setting to Jitterbuffer -1\n");
      }

      if ( ch->jb) {
         cb_log(0, bc->port, "config_jb: We've got a Jitterbuffer Already on this port.\n");
         misdn_jb_destroy(ch->jb);
         ch->jb = NULL;
      }

      ch->jb=misdn_jb_init(len, threshold);

      if (!ch->jb ) 
         bc->nojitter = 1;
   }
}


void debug_numplan(int port, int numplan, char *type)
{
   switch (numplan) {
   case NUMPLAN_INTERNATIONAL:
      chan_misdn_log(2, port, " --> %s: International\n", type);
      break;
   case NUMPLAN_NATIONAL:
      chan_misdn_log(2, port, " --> %s: National\n", type);
      break;
   case NUMPLAN_SUBSCRIBER:
      chan_misdn_log(2, port, " --> %s: Subscriber\n", type);
      break;
   case NUMPLAN_UNKNOWN:
      chan_misdn_log(2, port, " --> %s: Unknown\n", type);
      break;
      /* Maybe we should cut off the prefix if present ? */
   default:
      chan_misdn_log(0, port, " --> !!!! Wrong dialplan setting, please see the misdn.conf sample file\n ");
      break;
   }
}


#ifdef MISDN_1_2
static int update_pipeline_config(struct misdn_bchannel *bc)
{
   int ec;

   misdn_cfg_get(bc->port, MISDN_CFG_PIPELINE, bc->pipeline, sizeof(bc->pipeline));

   if (*bc->pipeline)
      return 0;

   misdn_cfg_get(bc->port, MISDN_CFG_ECHOCANCEL, &ec, sizeof(int));
   if (ec == 1)
      ast_copy_string(bc->pipeline, "mg2ec", sizeof(bc->pipeline));
   else if (ec > 1)
      snprintf(bc->pipeline, sizeof(bc->pipeline), "mg2ec(deftaps=%d)", ec);

   return 0;
}
#else
static int update_ec_config(struct misdn_bchannel *bc)
{
   int ec;
   int port = bc->port;

   misdn_cfg_get(port, MISDN_CFG_ECHOCANCEL, &ec, sizeof(int));

   if (ec == 1) {
      bc->ec_enable = 1;
   } else if (ec > 1) {
      bc->ec_enable = 1;
      bc->ec_deftaps = ec;
   }

   return 0;
}
#endif


static int read_config(struct chan_list *ch, int orig)
{
   struct ast_channel *ast;
   struct misdn_bchannel *bc;
   int port;
   int hdlc = 0;
   char lang[BUFFERSIZE + 1];
   char faxdetect[BUFFERSIZE + 1];
   char buf[256];
   char buf2[256];
   ast_group_t pg;
   ast_group_t cg;

   if (!ch) {
      ast_log(LOG_WARNING, "Cannot configure without chanlist\n");
      return -1;
   }

   ast = ch->ast;
   bc = ch->bc;
   if (! ast || ! bc) {
      ast_log(LOG_WARNING, "Cannot configure without ast || bc\n");
      return -1;
   }
   
   port = bc->port;
   chan_misdn_log(1, port, "read_config: Getting Config\n");

   misdn_cfg_get(port, MISDN_CFG_LANGUAGE, lang, BUFFERSIZE);
   ast_string_field_set(ast, language, lang);

   misdn_cfg_get(port, MISDN_CFG_MUSICCLASS, ch->mohinterpret, sizeof(ch->mohinterpret));

   misdn_cfg_get(port, MISDN_CFG_TXGAIN, &bc->txgain, sizeof(int));
   misdn_cfg_get(port, MISDN_CFG_RXGAIN, &bc->rxgain, sizeof(int));

   misdn_cfg_get(port, MISDN_CFG_INCOMING_EARLY_AUDIO, &ch->incoming_early_audio, sizeof(int));

   misdn_cfg_get(port, MISDN_CFG_SENDDTMF, &bc->send_dtmf, sizeof(int));
   
   misdn_cfg_get(port, MISDN_CFG_ASTDTMF, &ch->ast_dsp, sizeof(int));

   if (ch->ast_dsp) {
      ch->ignore_dtmf = 1;
   }

   misdn_cfg_get(port, MISDN_CFG_NEED_MORE_INFOS, &bc->need_more_infos, sizeof(int));
   misdn_cfg_get(port, MISDN_CFG_NTTIMEOUT, &ch->nttimeout, sizeof(int));

   misdn_cfg_get(port, MISDN_CFG_NOAUTORESPOND_ON_SETUP, &ch->noautorespond_on_setup, sizeof(int));

   misdn_cfg_get(port, MISDN_CFG_FAR_ALERTING, &ch->far_alerting, sizeof(int));

   misdn_cfg_get(port, MISDN_CFG_ALLOWED_BEARERS, &ch->allowed_bearers, BUFFERSIZE);

   misdn_cfg_get(port, MISDN_CFG_FAXDETECT, faxdetect, BUFFERSIZE);

   misdn_cfg_get(port, MISDN_CFG_HDLC, &hdlc, sizeof(int));

   if (hdlc) {
      switch (bc->capability) {
      case INFO_CAPABILITY_DIGITAL_UNRESTRICTED:
      case INFO_CAPABILITY_DIGITAL_RESTRICTED:
         chan_misdn_log(1, bc->port, " --> CONF HDLC\n");
         bc->hdlc = 1;
         break;
      }
      
   }
   /*Initialize new Jitterbuffer*/
   misdn_cfg_get(port, MISDN_CFG_JITTERBUFFER, &ch->jb_len, sizeof(int));
   misdn_cfg_get(port, MISDN_CFG_JITTERBUFFER_UPPER_THRESHOLD, &ch->jb_upper_threshold, sizeof(int));

   config_jitterbuffer(ch);

   misdn_cfg_get(bc->port, MISDN_CFG_CONTEXT, ch->context, sizeof(ch->context));

   ast_copy_string(ast->context, ch->context, sizeof(ast->context));

#ifdef MISDN_1_2
   update_pipeline_config(bc);
#else
   update_ec_config(bc);
#endif

   {
      int eb3;
      
      misdn_cfg_get( bc->port, MISDN_CFG_EARLY_BCONNECT, &eb3, sizeof(int));
      bc->early_bconnect=eb3;
   }

   misdn_cfg_get(port, MISDN_CFG_PICKUPGROUP, &pg, sizeof(pg));
   misdn_cfg_get(port, MISDN_CFG_CALLGROUP, &cg, sizeof(cg));

   chan_misdn_log(5, port, " --> * CallGrp:%s PickupGrp:%s\n", ast_print_group(buf, sizeof(buf), cg), ast_print_group(buf2, sizeof(buf2), pg));
   ast->pickupgroup = pg;
   ast->callgroup = cg;
   
   if (orig == ORG_AST) {
      char callerid[BUFFERSIZE + 1];

      /* ORIGINATOR Asterisk (outgoing call) */

      misdn_cfg_get(port, MISDN_CFG_TE_CHOOSE_CHANNEL, &(bc->te_choose_channel), sizeof(int));

      if (strstr(faxdetect, "outgoing") || strstr(faxdetect, "both")) {
         if (strstr(faxdetect, "nojump"))
            ch->faxdetect = 2;
         else
            ch->faxdetect = 1;
      }

      misdn_cfg_get(port, MISDN_CFG_CALLERID, callerid, BUFFERSIZE);
      if ( ! ast_strlen_zero(callerid) ) {
         chan_misdn_log(1, port, " --> * Setting Cid to %s\n", callerid);
         ast_copy_string(bc->oad, callerid, sizeof(bc->oad));
      }

      misdn_cfg_get(port, MISDN_CFG_DIALPLAN, &bc->dnumplan, sizeof(int));
      misdn_cfg_get(port, MISDN_CFG_LOCALDIALPLAN, &bc->onumplan, sizeof(int));
      misdn_cfg_get(port, MISDN_CFG_CPNDIALPLAN, &bc->cpnnumplan, sizeof(int));
      debug_numplan(port, bc->dnumplan, "TON");
      debug_numplan(port, bc->onumplan, "LTON");
      debug_numplan(port, bc->cpnnumplan, "CTON");

      ch->overlap_dial = 0;
   } else {
      /* ORIGINATOR MISDN (incoming call) */
      char prefix[BUFFERSIZE + 1] = "";

      if (strstr(faxdetect, "incoming") || strstr(faxdetect, "both")) {
         if (strstr(faxdetect, "nojump"))
            ch->faxdetect = 2;
         else
            ch->faxdetect = 1;
      }

      misdn_cfg_get(port, MISDN_CFG_CPNDIALPLAN, &bc->cpnnumplan, sizeof(int));
      debug_numplan(port, bc->cpnnumplan, "CTON");

      switch (bc->onumplan) {
      case NUMPLAN_INTERNATIONAL:
         misdn_cfg_get(bc->port, MISDN_CFG_INTERNATPREFIX, prefix, BUFFERSIZE);
         break;

      case NUMPLAN_NATIONAL:
         misdn_cfg_get(bc->port, MISDN_CFG_NATPREFIX, prefix, BUFFERSIZE);
         break;
      default:
         break;
      }

      ast_copy_string(buf, bc->oad, sizeof(buf));
      snprintf(bc->oad, sizeof(bc->oad), "%s%s", prefix, buf);

      if (!ast_strlen_zero(bc->dad)) {
         ast_copy_string(bc->orig_dad, bc->dad, sizeof(bc->orig_dad));
      }

      if ( ast_strlen_zero(bc->dad) && !ast_strlen_zero(bc->keypad)) {
         ast_copy_string(bc->dad, bc->keypad, sizeof(bc->dad));
      }

      prefix[0] = 0;

      switch (bc->dnumplan) {
      case NUMPLAN_INTERNATIONAL:
         misdn_cfg_get(bc->port, MISDN_CFG_INTERNATPREFIX, prefix, BUFFERSIZE);
         break;
      case NUMPLAN_NATIONAL:
         misdn_cfg_get(bc->port, MISDN_CFG_NATPREFIX, prefix, BUFFERSIZE);
         break;
      default:
         break;
      }

      ast_copy_string(buf, bc->dad, sizeof(buf));
      snprintf(bc->dad, sizeof(bc->dad), "%s%s", prefix, buf);

      if (strcmp(bc->dad, ast->exten)) {
         ast_copy_string(ast->exten, bc->dad, sizeof(ast->exten));
      }

      ast_set_callerid(ast, bc->oad, NULL, bc->oad);

      if ( !ast_strlen_zero(bc->rad) ) {
         if (ast->cid.cid_rdnis)
            free(ast->cid.cid_rdnis);
         ast->cid.cid_rdnis = strdup(bc->rad);
      }
   
      misdn_cfg_get(bc->port, MISDN_CFG_OVERLAP_DIAL, &ch->overlap_dial, sizeof(ch->overlap_dial));
      ast_mutex_init(&ch->overlap_tv_lock);
   } /* ORIG MISDN END */

   ch->overlap_dial_task = -1;
   
   if (ch->faxdetect  || ch->ast_dsp) {
      misdn_cfg_get(port, MISDN_CFG_FAXDETECT_TIMEOUT, &ch->faxdetect_timeout, sizeof(ch->faxdetect_timeout));
      if (!ch->dsp)
         ch->dsp = ast_dsp_new();
      if (ch->dsp) {
         if (ch->faxdetect) 
            ast_dsp_set_features(ch->dsp, DSP_FEATURE_DTMF_DETECT | DSP_FEATURE_FAX_DETECT);
         else 
            ast_dsp_set_features(ch->dsp, DSP_FEATURE_DTMF_DETECT );
      }
   }

   /* AOCD initialization */
   bc->AOCDtype = Fac_None;

   return 0;
}


/*****************************/
/*** AST Indications Start ***/
/*****************************/

static int misdn_call(struct ast_channel *ast, char *dest, int timeout)
{
   int port = 0;
   int r;
   int exceed;
   int bridging;
   struct chan_list *ch;
   struct misdn_bchannel *newbc;
   char *opts, *ext;
   char *dest_cp;

   if (!ast) {
      ast_log(LOG_WARNING, " --> ! misdn_call called on ast_channel *ast where ast == NULL\n");
      return -1;
   }

   if (((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) || !dest  ) {
      ast_log(LOG_WARNING, " --> ! misdn_call called on %s, neither down nor reserved (or dest==NULL)\n", ast->name);
      ast->hangupcause = AST_CAUSE_NORMAL_TEMPORARY_FAILURE;
      ast_setstate(ast, AST_STATE_DOWN);
      return -1;
   }

   ch = MISDN_ASTERISK_TECH_PVT(ast);
   if (!ch) {
      ast_log(LOG_WARNING, " --> ! misdn_call called on %s, neither down nor reserved (or dest==NULL)\n", ast->name);
      ast->hangupcause = AST_CAUSE_NORMAL_TEMPORARY_FAILURE;
      ast_setstate(ast, AST_STATE_DOWN);
      return -1;
   }
   
   newbc = ch->bc;
   if (!newbc) {
      ast_log(LOG_WARNING, " --> ! misdn_call called on %s, neither down nor reserved (or dest==NULL)\n", ast->name);
      ast->hangupcause = AST_CAUSE_NORMAL_TEMPORARY_FAILURE;
      ast_setstate(ast, AST_STATE_DOWN);
      return -1;
   }
   
   /*
    * dest is ---v
    * Dial(mISDN/g:group_name[/extension[/options]])
    * Dial(mISDN/port[:preselected_channel][/extension[/options]])
    *
    * The dial extension could be empty if you are using MISDN_KEYPAD
    * to control ISDN provider features.
    */
   dest_cp = ast_strdupa(dest);
   strsep(&dest_cp, "/");/* Discard port/group token */
   ext = strsep(&dest_cp, "/");
   if (!ext) {
      ext = "";
   }
   opts = dest_cp;
   
   port = newbc->port;

   if ((exceed = add_out_calls(port))) {
      char tmp[16];
      snprintf(tmp, sizeof(tmp), "%d", exceed);
      pbx_builtin_setvar_helper(ast, "MAX_OVERFLOW", tmp);
      return -1;
   }
   
   chan_misdn_log(1, port, "* CALL: %s\n", dest);
   
   chan_misdn_log(2, port, " --> * dad:%s tech:%s ctx:%s\n", ast->exten, ast->name, ast->context);
   
   chan_misdn_log(3, port, " --> * adding2newbc ext %s\n", ast->exten);
   if (ast->exten) {
      ast_copy_string(ast->exten, ext, sizeof(ast->exten));
      ast_copy_string(newbc->dad, ext, sizeof(newbc->dad));
   }

   ast_copy_string(newbc->rad, S_OR(ast->cid.cid_rdnis, ""), sizeof(newbc->rad));

   chan_misdn_log(3, port, " --> * adding2newbc callerid %s\n", ast->cid.cid_num);
   if (ast_strlen_zero(newbc->oad) && !ast_strlen_zero(ast->cid.cid_num)) {
      ast_copy_string(newbc->oad, ast->cid.cid_num, sizeof(newbc->oad));
   }

   newbc->capability = ast->transfercapability;
   pbx_builtin_setvar_helper(ast, "TRANSFERCAPABILITY", ast_transfercapability2str(newbc->capability));
   if ( ast->transfercapability == INFO_CAPABILITY_DIGITAL_UNRESTRICTED) {
      chan_misdn_log(2, port, " --> * Call with flag Digital\n");
   }

   /* update screening and presentation */ 
   update_config(ch, ORG_AST);
      
   /* fill in some ies from channel vary*/
   import_ch(ast, newbc, ch);

   /* Finally The Options Override Everything */
   if (opts)
      misdn_set_opt_exec(ast, opts);
   else
      chan_misdn_log(2, port, "NO OPTS GIVEN\n");

   /*check for bridging*/
   misdn_cfg_get(0, MISDN_GEN_BRIDGING, &bridging, sizeof(bridging));
   if (bridging && ch->other_ch) {
#ifdef MISDN_1_2
      chan_misdn_log(1, port, "Disabling EC (aka Pipeline) on both Sides\n");
      *ch->bc->pipeline = 0;
      *ch->other_ch->bc->pipeline = 0;
#else
      chan_misdn_log(1, port, "Disabling EC on both Sides\n");
      ch->bc->ec_enable = 0;
      ch->other_ch->bc->ec_enable = 0;
#endif
   }

   r = misdn_lib_send_event( newbc, EVENT_SETUP );

   /** we should have l3id after sending setup **/
   ch->l3id = newbc->l3_id;

   if ( r == -ENOCHAN  ) {
      chan_misdn_log(0, port, " --> * Theres no Channel at the moment .. !\n");
      chan_misdn_log(1, port, " --> * SEND: State Down pid:%d\n", newbc ? newbc->pid : -1);
      ast->hangupcause = AST_CAUSE_NORMAL_CIRCUIT_CONGESTION;
      ast_setstate(ast, AST_STATE_DOWN);
      return -1;
   }
   
   chan_misdn_log(2, port, " --> * SEND: State Dialing pid:%d\n", newbc ? newbc->pid : 1);

   ast_setstate(ast, AST_STATE_DIALING);
   ast->hangupcause = AST_CAUSE_NORMAL_CLEARING;
   
   if (newbc->nt)
      stop_bc_tones(ch);

   ch->state = MISDN_CALLING;
   
   return 0; 
}


static int misdn_answer(struct ast_channel *ast)
{
   struct chan_list *p;
   const char *tmp;

   if (!ast || !(p = MISDN_ASTERISK_TECH_PVT(ast))) return -1;
   
   chan_misdn_log(1, p ? (p->bc ? p->bc->port : 0) : 0, "* ANSWER:\n");
   
   if (!p) {
      ast_log(LOG_WARNING, " --> Channel not connected ??\n");
      ast_queue_hangup(ast);
   }

   if (!p->bc) {
      chan_misdn_log(1, 0, " --> Got Answer, but there is no bc obj ??\n");

      ast_queue_hangup(ast);
   }

   tmp = pbx_builtin_getvar_helper(p->ast, "CRYPT_KEY");
   if (!ast_strlen_zero(tmp)) {
      chan_misdn_log(1, p->bc->port, " --> Connection will be BF crypted\n");
      ast_copy_string(p->bc->crypt_key, tmp, sizeof(p->bc->crypt_key));
   } else {
      chan_misdn_log(3, p->bc->port, " --> Connection is without BF encryption\n");
   }

   tmp = pbx_builtin_getvar_helper(ast, "MISDN_DIGITAL_TRANS");
   if (!ast_strlen_zero(tmp) && ast_true(tmp)) {
      chan_misdn_log(1, p->bc->port, " --> Connection is transparent digital\n");
      p->bc->nodsp = 1;
      p->bc->hdlc = 0;
      p->bc->nojitter = 1;
   }

   p->state = MISDN_CONNECTED;
   stop_indicate(p);

   if ( ast_strlen_zero(p->bc->cad) ) {
      chan_misdn_log(2,p->bc->port," --> empty cad using dad\n");
      ast_copy_string(p->bc->cad, p->bc->dad, sizeof(p->bc->cad));
   }

   misdn_lib_send_event( p->bc, EVENT_CONNECT);
   start_bc_tones(p);

   return 0;
}

static int misdn_digit_begin(struct ast_channel *chan, char digit)
{
   /* XXX Modify this callback to support Asterisk controlling the length of DTMF */
   return 0;
}

static int misdn_digit_end(struct ast_channel *ast, char digit, unsigned int duration)
{
   struct chan_list *p;
   struct misdn_bchannel *bc;

   if (!ast || !(p = MISDN_ASTERISK_TECH_PVT(ast))) return -1;

   bc = p->bc;
   chan_misdn_log(1, bc ? bc->port : 0, "* IND : Digit %c\n", digit);
   
   if (!bc) {
      ast_log(LOG_WARNING, " --> !! Got Digit Event without having bchannel Object\n");
      return -1;
   }
   
   switch (p->state ) {
   case MISDN_CALLING:
      {
         int l;      
         char buf[8];
         buf[0]=digit;
         buf[1]=0;
         
         l = sizeof(bc->infos_pending);
         strncat(bc->infos_pending, buf, l - strlen(bc->infos_pending) - 1);
      }
      break;
   case MISDN_CALLING_ACKNOWLEDGE:
      {
         bc->info_dad[0]=digit;
         bc->info_dad[1]=0;
         
         {
            int l = sizeof(bc->dad);
            strncat(bc->dad, bc->info_dad, l - strlen(bc->dad) - 1);
         }
         {
            int l = sizeof(p->ast->exten);
            strncpy(p->ast->exten, bc->dad, l);
            p->ast->exten[l-1] = 0;
         }
         
         misdn_lib_send_event( bc, EVENT_INFORMATION);
      }
      break;
   default: 
         if ( bc->send_dtmf ) 
            send_digit_to_chan(p,digit);
      break;
   }

   return 0;
}


static int misdn_fixup(struct ast_channel *oldast, struct ast_channel *ast)
{
   struct chan_list *p;

   if (!ast || ! (p=MISDN_ASTERISK_TECH_PVT(ast) )) return -1;

   chan_misdn_log(1, p->bc ? p->bc->port : 0, "* IND: Got Fixup State:%s L3id:%x\n", misdn_get_ch_state(p), p->l3id);

   p->ast = ast;

   return 0;
}



static int misdn_indication(struct ast_channel *ast, int cond, const void *data, size_t datalen)
{
   struct chan_list *p;

   if (!ast || ! (p=MISDN_ASTERISK_TECH_PVT(ast))) {
      ast_log(LOG_WARNING, "Returned -1 in misdn_indication\n");
      return -1;
   }
   
   if (!p->bc) {
      if (p->hold.state == MISDN_HOLD_IDLE) {
         chan_misdn_log(1, 0, "* IND : Indication [%d] ignored on %s\n", cond,
            ast->name);
         ast_log(LOG_WARNING, "Private Pointer but no bc ?\n");
      } else {
         chan_misdn_log(1, 0, "* IND : Indication [%d] ignored on hold %s\n",
            cond, ast->name);
      }
      return -1;
   }
   
   chan_misdn_log(5, p->bc->port, "* IND : Indication [%d] on %s\n\n", cond, ast->name);
   
   switch (cond) {
   case AST_CONTROL_BUSY:
      chan_misdn_log(1, p->bc->port, "* IND :\tbusy pid:%d\n", p->bc ? p->bc->pid : -1);
      ast_setstate(ast, AST_STATE_BUSY);

      p->bc->out_cause = AST_CAUSE_USER_BUSY;
      if (p->state != MISDN_CONNECTED) {
         start_bc_tones(p);
         misdn_lib_send_event( p->bc, EVENT_DISCONNECT);
      }
      return -1;
   case AST_CONTROL_RING:
      chan_misdn_log(1, p->bc->port, "* IND :\tring pid:%d\n", p->bc ? p->bc->pid : -1);
      return -1;
   case AST_CONTROL_RINGING:
      chan_misdn_log(1, p->bc->port, "* IND :\tringing pid:%d\n", p->bc ? p->bc->pid : -1);
      switch (p->state) {
      case MISDN_ALERTING:
         chan_misdn_log(2, p->bc->port, " --> * IND :\tringing pid:%d but I was Ringing before, so ignoring it\n", p->bc ? p->bc->pid : -1);
         break;
      case MISDN_CONNECTED:
         chan_misdn_log(2, p->bc->port, " --> * IND :\tringing pid:%d but Connected, so just send TONE_ALERTING without state changes \n", p->bc ? p->bc->pid : -1);
         return -1;
      default:
         p->state = MISDN_ALERTING;
         chan_misdn_log(2, p->bc->port, " --> * IND :\tringing pid:%d\n", p->bc ? p->bc->pid : -1);
         misdn_lib_send_event( p->bc, EVENT_ALERTING);

         if (p->other_ch && p->other_ch->bc) {
            if (misdn_inband_avail(p->other_ch->bc)) {
               chan_misdn_log(2, p->bc->port, " --> other End is mISDN and has inband info available\n");
               break;
            }

            if (!p->other_ch->bc->nt) {
               chan_misdn_log(2, p->bc->port, " --> other End is mISDN TE so it has inband info for sure (?)\n");
               break;
            }
         }

         chan_misdn_log(3, p->bc->port, " --> * SEND: State Ring pid:%d\n", p->bc ? p->bc->pid : -1);
         ast_setstate(ast, AST_STATE_RING);

         if (!p->bc->nt && (p->originator == ORG_MISDN) && !p->incoming_early_audio)
            chan_misdn_log(2, p->bc->port, " --> incoming_early_audio off\n");
         else 
            return -1;
      }
      break;
   case AST_CONTROL_ANSWER:
      chan_misdn_log(1, p->bc->port, " --> * IND :\tanswer pid:%d\n", p->bc ? p->bc->pid : -1);
      start_bc_tones(p);
      break;
   case AST_CONTROL_TAKEOFFHOOK:
      chan_misdn_log(1, p->bc->port, " --> *\ttakeoffhook pid:%d\n", p->bc ? p->bc->pid : -1);
      return -1;
   case AST_CONTROL_OFFHOOK:
      chan_misdn_log(1, p->bc->port, " --> *\toffhook pid:%d\n", p->bc ? p->bc->pid : -1);
      return -1;
   case AST_CONTROL_FLASH:
      chan_misdn_log(1, p->bc->port, " --> *\tflash pid:%d\n", p->bc ? p->bc->pid : -1);
      break;
   case AST_CONTROL_PROGRESS:
      chan_misdn_log(1, p->bc->port, " --> * IND :\tprogress pid:%d\n", p->bc ? p->bc->pid : -1);
      misdn_lib_send_event( p->bc, EVENT_PROGRESS);
      break;
   case AST_CONTROL_PROCEEDING:
      chan_misdn_log(1, p->bc->port, " --> * IND :\tproceeding pid:%d\n", p->bc ? p->bc->pid : -1);
      misdn_lib_send_event( p->bc, EVENT_PROCEEDING);
      break;
   case AST_CONTROL_CONGESTION:
      chan_misdn_log(1, p->bc->port, " --> * IND :\tcongestion pid:%d\n", p->bc ? p->bc->pid : -1);

      p->bc->out_cause = AST_CAUSE_SWITCH_CONGESTION;
      start_bc_tones(p);
      misdn_lib_send_event( p->bc, EVENT_DISCONNECT);

      if (p->bc->nt) {
         hanguptone_indicate(p);
      }
      break;
   case -1 :
      chan_misdn_log(1, p->bc->port, " --> * IND :\t-1! (stop indication) pid:%d\n", p->bc ? p->bc->pid : -1);

      stop_indicate(p);

      if (p->state == MISDN_CONNECTED) 
         start_bc_tones(p);
      break;
   case AST_CONTROL_HOLD:
      ast_moh_start(ast, data, p->mohinterpret); 
      chan_misdn_log(1, p->bc->port, " --> *\tHOLD pid:%d\n", p->bc ? p->bc->pid : -1);
      break;
   case AST_CONTROL_UNHOLD:
      ast_moh_stop(ast);
      chan_misdn_log(1, p->bc->port, " --> *\tUNHOLD pid:%d\n", p->bc ? p->bc->pid : -1);
      break;
   default:
      chan_misdn_log(1, p->bc->port, " --> * Unknown Indication:%d pid:%d\n", cond, p->bc ? p->bc->pid : -1);
      return -1;
   }
  
   return 0;
}

static int misdn_hangup(struct ast_channel *ast)
{
   struct chan_list *p;
   struct misdn_bchannel *bc;
   const char *var;

   if (!ast || !(p = MISDN_ASTERISK_TECH_PVT(ast))) {
      return -1;
   }
   MISDN_ASTERISK_TECH_PVT(ast) = NULL;

   ast_log(LOG_DEBUG, "misdn_hangup(%s)\n", ast->name);

   if (p->hold.state == MISDN_HOLD_IDLE) {
      bc = p->bc;
   } else {
      p->hold.state = MISDN_HOLD_DISCONNECT;
      bc = misdn_lib_find_held_bc(p->hold.port, p->l3id);
      if (!bc) {
         chan_misdn_log(4, p->hold.port,
            "misdn_hangup: Could not find held bc for (%s)\n", ast->name);
         release_chan_early(p);
         return 0;
      }
   }

   if (ast->_state == AST_STATE_RESERVED || p->state == MISDN_NOTHING) {
      /* between request and call */
      ast_log(LOG_DEBUG, "State Reserved (or nothing) => chanIsAvail\n");
      release_chan_early(p);
      if (bc) {
         misdn_lib_release(bc);
      }
      return 0;
   }
   if (!bc) {
      ast_log(LOG_WARNING, "Hangup with private but no bc ? state:%s l3id:%x\n",
         misdn_get_ch_state(p), p->l3id);
      release_chan_early(p);
      return 0;
   }

   p->ast = NULL;
   p->need_hangup = 0;
   p->need_queue_hangup = 0;
   p->need_busy = 0;

   if (!bc->nt) {
      stop_bc_tones(p);
   }

   bc->out_cause = ast->hangupcause ? ast->hangupcause : AST_CAUSE_NORMAL_CLEARING;

   var = pbx_builtin_getvar_helper(ast, "HANGUPCAUSE");
   if (!var) {
      var = pbx_builtin_getvar_helper(ast, "PRI_CAUSE");
   }
   if (var) {
      int tmpcause;

      tmpcause = atoi(var);
      bc->out_cause = tmpcause ? tmpcause : AST_CAUSE_NORMAL_CLEARING;
   }

   var = pbx_builtin_getvar_helper(ast, "MISDN_USERUSER");
   if (var) {
      ast_log(LOG_NOTICE, "MISDN_USERUSER: %s\n", var);
      ast_copy_string(bc->uu, var, sizeof(bc->uu));
      bc->uulen = strlen(bc->uu);
   }

   chan_misdn_log(1, bc->port,
      "* IND : HANGUP\tpid:%d ctx:%s dad:%s oad:%s State:%s\n",
      bc->pid,
      ast->context,
      ast->exten,
      ast->cid.cid_num,
      misdn_get_ch_state(p));
   chan_misdn_log(3, bc->port, " --> l3id:%x\n", p->l3id);
   chan_misdn_log(3, bc->port, " --> cause:%d\n", bc->cause);
   chan_misdn_log(2, bc->port, " --> out_cause:%d\n", bc->out_cause);

   switch (p->state) {
   case MISDN_INCOMING_SETUP:
      /*
       * This is the only place in misdn_hangup, where we
       * can call release_chan, else it might create a lot of trouble.
       */
      ast_log(LOG_NOTICE, "release channel, in INCOMING_SETUP state.. no other events happened\n");
      release_chan(p, bc);

      if (bc->need_release_complete) {
         misdn_lib_send_event(bc, EVENT_RELEASE_COMPLETE);
      }
      return 0;
   case MISDN_DIALING:
      if (p->hold.state == MISDN_HOLD_IDLE) {
         start_bc_tones(p);
         hanguptone_indicate(p);
      }

      if (bc->need_disconnect) {
         misdn_lib_send_event(bc, EVENT_DISCONNECT);
      }
      break;
   case MISDN_CALLING_ACKNOWLEDGE:
      if (p->hold.state == MISDN_HOLD_IDLE) {
         start_bc_tones(p);
         hanguptone_indicate(p);
      }

      if (bc->need_disconnect) {
         misdn_lib_send_event(bc, EVENT_DISCONNECT);
      }
      break;

   case MISDN_CALLING:
   case MISDN_ALERTING:
   case MISDN_PROGRESS:
   case MISDN_PROCEEDING:
      if (p->originator != ORG_AST && p->hold.state == MISDN_HOLD_IDLE) {
         hanguptone_indicate(p);
      }

      if (bc->need_disconnect) {
         misdn_lib_send_event(bc, EVENT_DISCONNECT);
      }
      break;
   case MISDN_CONNECTED:
      /*  Alerting or Disconnect */
      if (bc->nt && p->hold.state == MISDN_HOLD_IDLE) {
         start_bc_tones(p);
         hanguptone_indicate(p);
         bc->progress_indicator = INFO_PI_INBAND_AVAILABLE;
      }
      if (bc->need_disconnect) {
         misdn_lib_send_event(bc, EVENT_DISCONNECT);
      }
      break;
   case MISDN_DISCONNECTED:
      if (bc->need_release) {
         misdn_lib_send_event(bc, EVENT_RELEASE);
      }
      break;

   case MISDN_CLEANING:
      return 0;

   case MISDN_BUSY:
      break;
   default:
      if (bc->nt) {
         bc->out_cause = -1;
         if (bc->need_release) {
            misdn_lib_send_event(bc, EVENT_RELEASE);
         }
      } else {
         if (bc->need_disconnect) {
            misdn_lib_send_event(bc, EVENT_DISCONNECT);
         }
      }
      break;
   }

   p->state = MISDN_CLEANING;
   chan_misdn_log(3, bc->port, " --> Channel: %s hungup new state:%s\n", ast->name,
      misdn_get_ch_state(p));

   return 0;
}


static struct ast_frame *process_ast_dsp(struct chan_list *tmp, struct ast_frame *frame)
{
   struct ast_frame *f;
 
   if (tmp->dsp) {
      f = ast_dsp_process(tmp->ast, tmp->dsp, frame);
   } else {
      chan_misdn_log(0, tmp->bc->port, "No DSP-Path found\n");
      return NULL;
   }

   if (!f || (f->frametype != AST_FRAME_DTMF)) {
      return f;
   }
 
   ast_log(LOG_DEBUG, "Detected inband DTMF digit: %c\n", f->subclass);
 
   if (tmp->faxdetect && (f->subclass == 'f')) {
      /* Fax tone -- Handle and return NULL */
      if (!tmp->faxhandled) {
         struct ast_channel *ast = tmp->ast;
         tmp->faxhandled++;
         chan_misdn_log(0, tmp->bc->port, "Fax detected, preparing %s for fax transfer.\n", ast->name);
         tmp->bc->rxgain = 0;
         isdn_lib_update_rxgain(tmp->bc);
         tmp->bc->txgain = 0;
         isdn_lib_update_txgain(tmp->bc);
#ifdef MISDN_1_2
         *tmp->bc->pipeline = 0;
#else
         tmp->bc->ec_enable = 0;
#endif
         isdn_lib_update_ec(tmp->bc);
         isdn_lib_stop_dtmf(tmp->bc);
         switch (tmp->faxdetect) {
         case 1:
            if (strcmp(ast->exten, "fax")) {
               char *context;
               char context_tmp[BUFFERSIZE];
               misdn_cfg_get(tmp->bc->port, MISDN_CFG_FAXDETECT_CONTEXT, &context_tmp, sizeof(context_tmp));
               context = ast_strlen_zero(context_tmp) ? (ast_strlen_zero(ast->macrocontext) ? ast->context : ast->macrocontext) : context_tmp;
               if (ast_exists_extension(ast, context, "fax", 1, ast->cid.cid_num)) {
                  if (option_verbose > 2)
                     ast_verbose(VERBOSE_PREFIX_3 "Redirecting %s to fax extension (context:%s)\n", ast->name, context);
                  /* Save the DID/DNIS when we transfer the fax call to a "fax" extension */
                  pbx_builtin_setvar_helper(ast,"FAXEXTEN",ast->exten);
                  if (ast_async_goto(ast, context, "fax", 1))
                     ast_log(LOG_WARNING, "Failed to async goto '%s' into fax of '%s'\n", ast->name, context);
               } else
                  ast_log(LOG_NOTICE, "Fax detected, but no fax extension ctx:%s exten:%s\n", context, ast->exten);
            } else {
               ast_log(LOG_DEBUG, "Already in a fax extension, not redirecting\n");
            }
            break;
         case 2:
            ast_verbose(VERBOSE_PREFIX_3 "Not redirecting %s to fax extension, nojump is set.\n", ast->name);
            break;
         }
      } else {
         ast_log(LOG_DEBUG, "Fax already handled\n");
      }
   }
   
   if (tmp->ast_dsp && (f->subclass != 'f')) {
      chan_misdn_log(2, tmp->bc->port, " --> * SEND: DTMF (AST_DSP) :%c\n", f->subclass);
   }

   return f;
}


static struct ast_frame *misdn_read(struct ast_channel *ast)
{
   struct chan_list *tmp;
   int len, t;
   struct pollfd pfd = { .fd = -1, .events = POLLIN };

   if (!ast) {
      chan_misdn_log(1, 0, "misdn_read called without ast\n");
      return NULL;
   }
   if (!(tmp = MISDN_ASTERISK_TECH_PVT(ast))) {
      chan_misdn_log(1, 0, "misdn_read called without ast->pvt\n");
      return NULL;
   }

   if (!tmp->bc && tmp->hold.state == MISDN_HOLD_IDLE) {
      chan_misdn_log(1, 0, "misdn_read called without bc\n");
      return NULL;
   }

   pfd.fd = tmp->pipe[0];
   t = ast_poll(&pfd, 1, 20);

   if (t < 0) {
      chan_misdn_log(-1, tmp->bc->port, "poll() error (err=%s)\n", strerror(errno));
      return NULL;
   }

   if (!t) {
      chan_misdn_log(3, tmp->bc->port, "poll() timed out\n");
      len = 160;
   } else if (pfd.revents & POLLIN) {
      len = read(tmp->pipe[0], tmp->ast_rd_buf, sizeof(tmp->ast_rd_buf));

      if (len <= 0) {
         /* we hangup here, since our pipe is closed */
         chan_misdn_log(2, tmp->bc->port, "misdn_read: Pipe closed, hanging up\n");
         return NULL;
      }

   } else {
      return NULL;
   }

   tmp->frame.frametype = AST_FRAME_VOICE;
   tmp->frame.subclass = AST_FORMAT_ALAW;
   tmp->frame.datalen = len;
   tmp->frame.samples = len;
   tmp->frame.mallocd = 0;
   tmp->frame.offset = 0;
   tmp->frame.delivery = ast_tv(0,0);
   tmp->frame.src = NULL;
   tmp->frame.data = tmp->ast_rd_buf;

   if (tmp->faxdetect && !tmp->faxhandled) {
      if (tmp->faxdetect_timeout) {
         if (ast_tvzero(tmp->faxdetect_tv)) {
            tmp->faxdetect_tv = ast_tvnow();
            chan_misdn_log(2, tmp->bc->port, "faxdetect: starting detection with timeout: %ds ...\n", tmp->faxdetect_timeout);
            return process_ast_dsp(tmp, &tmp->frame);
         } else {
            struct timeval tv_now = ast_tvnow();
            int diff = ast_tvdiff_ms(tv_now, tmp->faxdetect_tv);
            if (diff <= (tmp->faxdetect_timeout * 1000)) {
               chan_misdn_log(5, tmp->bc->port, "faxdetect: detecting ...\n");
               return process_ast_dsp(tmp, &tmp->frame);
            } else {
               chan_misdn_log(2, tmp->bc->port, "faxdetect: stopping detection (time ran out) ...\n");
               tmp->faxdetect = 0;
               return &tmp->frame;
            }
         }
      } else {
         chan_misdn_log(5, tmp->bc->port, "faxdetect: detecting ... (no timeout)\n");
         return process_ast_dsp(tmp, &tmp->frame);
      }
   } else {
      if (tmp->ast_dsp)
         return process_ast_dsp(tmp, &tmp->frame);
      else
         return &tmp->frame;
   }
}


static int misdn_write(struct ast_channel *ast, struct ast_frame *frame)
{
   struct chan_list *ch;
   int i  = 0;
   
   if (!ast || ! (ch = MISDN_ASTERISK_TECH_PVT(ast)) ) return -1;

   if (ch->hold.state != MISDN_HOLD_IDLE) {
      chan_misdn_log(7, 0, "misdn_write: Returning because hold active\n");
      return 0;
   }
   
   if (!ch->bc ) {
      ast_log(LOG_WARNING, "private but no bc\n");
      return -1;
   }
   
   if (ch->notxtone) {
      chan_misdn_log(7, ch->bc->port, "misdn_write: Returning because notxtone\n");
      return 0;
   }


   if (!frame->subclass) {
      chan_misdn_log(4, ch->bc->port, "misdn_write: * prods us\n");
      return 0;
   }
   
   if (!(frame->subclass & prefformat)) {
      
      chan_misdn_log(-1, ch->bc->port, "Got Unsupported Frame with Format:%d\n", frame->subclass);
      return 0;
   }
   

   if (!frame->samples ) {
      chan_misdn_log(4, ch->bc->port, "misdn_write: zero write\n");
      
      if (!strcmp(frame->src,"ast_prod")) {
         chan_misdn_log(1, ch->bc->port, "misdn_write: state (%s) prodded.\n", misdn_get_ch_state(ch));

         if (ch->ts) {
            chan_misdn_log(4, ch->bc->port, "Starting Playtones\n");
            misdn_lib_tone_generator_start(ch->bc);
         }
         return 0;
      }

      return -1;
   }

   if ( ! ch->bc->addr ) {
      chan_misdn_log(8, ch->bc->port, "misdn_write: no addr for bc dropping:%d\n", frame->samples);
      return 0;
   }
   
#ifdef MISDN_DEBUG
   {
      int i, max = 5 > frame->samples ? frame->samples : 5;

      printf("write2mISDN %p %d bytes: ", p, frame->samples);

      for (i = 0; i < max; i++)
         printf("%2.2x ", ((char*) frame->data)[i]);
      printf ("\n");
   }
#endif

   switch (ch->bc->bc_state) {
   case BCHAN_ACTIVATED:
   case BCHAN_BRIDGED:
      break;
   default:
      if (!ch->dropped_frame_cnt)
         chan_misdn_log(5, ch->bc->port, "BC not active (nor bridged) dropping: %d frames addr:%x exten:%s cid:%s ch->state:%s bc_state:%d l3id:%x\n", frame->samples, ch->bc->addr, ast->exten, ast->cid.cid_num, misdn_get_ch_state( ch), ch->bc->bc_state, ch->bc->l3_id);
      
      ch->dropped_frame_cnt++;
      if (ch->dropped_frame_cnt > 100) {
         ch->dropped_frame_cnt = 0;
         chan_misdn_log(5, ch->bc->port, "BC not active (nor bridged) dropping: %d frames addr:%x  dropped > 100 frames!\n", frame->samples, ch->bc->addr);
      }

      return 0;
   }

   chan_misdn_log(9, ch->bc->port, "Sending :%d bytes to MISDN\n", frame->samples);
   if ( !ch->bc->nojitter && misdn_cap_is_speech(ch->bc->capability) ) {
      /* Buffered Transmit (triggered by read from isdn side)*/
      if (misdn_jb_fill(ch->jb, frame->data, frame->samples) < 0) {
         if (ch->bc->active)
            cb_log(0, ch->bc->port, "Misdn Jitterbuffer Overflow.\n");
      }
      
   } else {
      /*transmit without jitterbuffer*/
      i = misdn_lib_tx2misdn_frm(ch->bc, frame->data, frame->samples);
   }

   return 0;
}




static enum ast_bridge_result  misdn_bridge (struct ast_channel *c0,
                  struct ast_channel *c1, int flags,
                  struct ast_frame **fo,
                  struct ast_channel **rc,
                  int timeoutms)

{
   struct chan_list *ch1, *ch2;
   struct ast_channel *carr[2], *who;
   int to = -1;
   struct ast_frame *f;
   int p1_b, p2_b;
   int bridging;
  
   ch1 = get_chan_by_ast(c0);
   ch2 = get_chan_by_ast(c1);

   carr[0] = c0;
   carr[1] = c1;
  
   if (!(ch1 && ch2))
      return -1;

   misdn_cfg_get(ch1->bc->port, MISDN_CFG_BRIDGING, &p1_b, sizeof(int));
   misdn_cfg_get(ch2->bc->port, MISDN_CFG_BRIDGING, &p2_b, sizeof(int));

   if (! p1_b || ! p2_b) {
      ast_log(LOG_NOTICE, "Falling back to Asterisk bridging\n");
      return AST_BRIDGE_FAILED;
   }

   misdn_cfg_get(0, MISDN_GEN_BRIDGING, &bridging, sizeof(int));
   if (bridging) {
      /* trying to make a mISDN_dsp conference */
      chan_misdn_log(1, ch1->bc->port, "I SEND: Making conference with Number:%d\n", ch1->bc->pid + 1);
      misdn_lib_bridge(ch1->bc, ch2->bc);
   }

   if (option_verbose > 2) 
      ast_verbose(VERBOSE_PREFIX_3 "Native bridging %s and %s\n", c0->name, c1->name);

   chan_misdn_log(1, ch1->bc->port, "* Making Native Bridge between %s and %s\n", ch1->bc->oad, ch2->bc->oad);
 
   if (! (flags & AST_BRIDGE_DTMF_CHANNEL_0) )
      ch1->ignore_dtmf = 1;

   if (! (flags & AST_BRIDGE_DTMF_CHANNEL_1) )
      ch2->ignore_dtmf = 1;

   for (;/*ever*/;) {
      to = -1;
      who = ast_waitfor_n(carr, 2, &to);

      if (!who) {
         ast_log(LOG_NOTICE, "misdn_bridge: empty read, breaking out\n");
         break;
      }
      f = ast_read(who);

      if (!f || f->frametype == AST_FRAME_CONTROL) {
         /* got hangup .. */

         if (!f) 
            chan_misdn_log(4, ch1->bc->port, "Read Null Frame\n");
         else
            chan_misdn_log(4, ch1->bc->port, "Read Frame Control class:%d\n", f->subclass);

         *fo = f;
         *rc = who;
         break;
      }
      
      if ( f->frametype == AST_FRAME_DTMF ) {
         chan_misdn_log(1, 0, "Read DTMF %d from %s\n", f->subclass, who->exten);

         *fo = f;
         *rc = who;
         break;
      }
   
#if 0
      if (f->frametype == AST_FRAME_VOICE) {
         chan_misdn_log(1, ch1->bc->port, "I SEND: Splitting conference with Number:%d\n", ch1->bc->pid +1);
   
         continue;
      }
#endif

      if (who == c0) {
         ast_write(c1, f);
      }
      else {
         ast_write(c0, f);
      }
   }

   chan_misdn_log(1, ch1->bc->port, "I SEND: Splitting conference with Number:%d\n", ch1->bc->pid + 1);

   misdn_lib_split_bridge(ch1->bc, ch2->bc);

   return AST_BRIDGE_COMPLETE;
}

/** AST INDICATIONS END **/

static int dialtone_indicate(struct chan_list *cl)
{
   const struct tone_zone_sound *ts = NULL;
   struct ast_channel *ast = cl->ast;
   int nd = 0;

   if (!ast) {
      chan_misdn_log(0, cl->bc->port, "No Ast in dialtone_indicate\n");
      return -1;
   }

   misdn_cfg_get(cl->bc->port, MISDN_CFG_NODIALTONE, &nd, sizeof(nd));

   if (nd) {
      chan_misdn_log(1, cl->bc->port, "Not sending Dialtone, because config wants it\n");
      return 0;
   }
   
   chan_misdn_log(3, cl->bc->port, " --> Dial\n");
   ts = ast_get_indication_tone(ast->zone, "dial");
   cl->ts = ts;   
   
   if (ts) {
      cl->notxtone = 0;
      cl->norxtone = 0;
      /* This prods us in misdn_write */
      ast_playtones_start(ast, 0, ts->data, 0);
   }

   return 0;
}

static void hanguptone_indicate(struct chan_list *cl)
{
   misdn_lib_send_tone(cl->bc, TONE_HANGUP);
}

static int stop_indicate(struct chan_list *cl)
{
   struct ast_channel *ast = cl->ast;

   if (!ast) {
      chan_misdn_log(0, cl->bc->port, "No Ast in stop_indicate\n");
      return -1;
   }

   chan_misdn_log(3, cl->bc->port, " --> None\n");
   misdn_lib_tone_generator_stop(cl->bc);
   ast_playtones_stop(ast);

   cl->ts = NULL;
   /*ast_deactivate_generator(ast);*/

   return 0;
}


static int start_bc_tones(struct chan_list* cl)
{
   misdn_lib_tone_generator_stop(cl->bc);
   cl->notxtone = 0;
   cl->norxtone = 0;
   return 0;
}

static int stop_bc_tones(struct chan_list *cl)
{
   if (!cl) return -1;

   cl->notxtone = 1;
   cl->norxtone = 1;
   
   return 0;
}


static struct chan_list *init_chan_list(int orig)
{
   struct chan_list *cl;

   cl = calloc(1, sizeof(struct chan_list));
   if (!cl) {
      chan_misdn_log(-1, 0, "misdn_request: malloc failed!");
      return NULL;
   }
   
   cl->originator = orig;
   cl->need_queue_hangup = 1;
   cl->need_hangup = 1;
   cl->need_busy = 1;
   cl->overlap_dial_task = -1;

   return cl;
}

static struct ast_channel *misdn_request(const char *type, int format, void *data, int *cause)
{
   struct ast_channel *tmp = NULL;
   char group[BUFFERSIZE + 1] = "";
   char dial_str[128];
   char *buf2 = ast_strdupa(data);
   char *ext;
   char *port_str;
   char *p = NULL;
   int channel = 0;
   int port = 0;
   struct misdn_bchannel *newbc = NULL;
   int dec = 0;
   struct chan_list *cl;

   snprintf(dial_str, sizeof(dial_str), "%s/%s", misdn_type, (char *) data);

   /*
    * data is ---v
    * Dial(mISDN/g:group_name[/extension[/options]])
    * Dial(mISDN/port[:preselected_channel][/extension[/options]])
    *
    * The dial extension could be empty if you are using MISDN_KEYPAD
    * to control ISDN provider features.
    */
   port_str = strsep(&buf2, "/");
   if (!ast_strlen_zero(port_str)) {
      if (port_str[0] == 'g' && port_str[1] == ':' ) {
         /* We make a group call lets checkout which ports are in my group */
         port_str += 2;
         ast_copy_string(group, port_str, sizeof(group));
         chan_misdn_log(2, 0, " --> Group Call group: %s\n", group);
      } else if ((p = strchr(port_str, ':'))) {
         /* we have a preselected channel */
         *p = 0;
         channel = atoi(++p);
         port = atoi(port_str);
         chan_misdn_log(2, port, " --> Call on preselected Channel (%d).\n", channel);
      } else {
         port = atoi(port_str);
      }
   } else {
      ast_log(LOG_WARNING, " --> ! IND : Dial(%s) WITHOUT Port or Group, check extensions.conf\n", dial_str);
      return NULL;
   }

   ext = strsep(&buf2, "/");
   if (!ext) {
      ext = "";
   }

   if (misdn_cfg_is_group_method(group, METHOD_STANDARD_DEC)) {
      chan_misdn_log(4, port, " --> STARTING STANDARD DEC...\n");
      dec = 1;
   }

   if (!ast_strlen_zero(group)) {
      char cfg_group[BUFFERSIZE + 1];
      struct robin_list *rr = NULL;

      /* Group dial */

      if (misdn_cfg_is_group_method(group, METHOD_ROUND_ROBIN)) {
         chan_misdn_log(4, port, " --> STARTING ROUND ROBIN...\n");
         rr = get_robin_position(group);
      }

      if (rr) {
         int port_start = 0;
         int port_bak = rr->port;
         int chan_bak = rr->channel;

         if (!rr->port)
            rr->port = misdn_cfg_get_next_port_spin(rr->port);
         
         for (; rr->port > 0; rr->port = misdn_cfg_get_next_port_spin(rr->port)) {
            int port_up;
            int check;
            int max_chan;
            int last_chance = 0;

            misdn_cfg_get(rr->port, MISDN_CFG_GROUPNAME, cfg_group, BUFFERSIZE);
            if (strcasecmp(cfg_group, group))
               continue;

            misdn_cfg_get(rr->port, MISDN_CFG_PMP_L1_CHECK, &check, sizeof(int));
            port_up = misdn_lib_port_up(rr->port, check);

            if (check && !port_up) 
               chan_misdn_log(1, rr->port, "L1 is not Up on this Port\n");

            if (check && port_up < 0)
               ast_log(LOG_WARNING,"This port (%d) is blocked\n", rr->port);

            if ((port_start == rr->port) && (port_up <= 0))
               break;

            if (!port_start)
               port_start = rr->port;

            if (port_up <= 0)
               continue;

            max_chan = misdn_lib_get_maxchans(rr->port);

            for (++rr->channel; !last_chance && rr->channel <= max_chan; ++rr->channel) {
               if (rr->port == port_bak && rr->channel == chan_bak)
                  last_chance = 1;

               chan_misdn_log(1, 0, "trying port:%d channel:%d\n", rr->port, rr->channel);
               newbc = misdn_lib_get_free_bc(rr->port, rr->channel, 0, 0);
               if (newbc) {
                  chan_misdn_log(4, rr->port, " Success! Found port:%d channel:%d\n", newbc->port, newbc->channel);
                  if (port_up)
                     chan_misdn_log(4, rr->port, "portup:%d\n",  port_up);
                  port = rr->port;
                  break;
               }
            }

            if (newbc || last_chance)
               break;

            rr->channel = 0;
         }
         if (!newbc) {
            rr->port = port_bak;
            rr->channel = chan_bak;
         }
      } else {    
         for (port = misdn_cfg_get_next_port(0); port > 0;
             port = misdn_cfg_get_next_port(port)) {

            misdn_cfg_get(port, MISDN_CFG_GROUPNAME, cfg_group, BUFFERSIZE);

            chan_misdn_log(3, port, "Group [%s] Port [%d]\n", group, port);
            if (!strcasecmp(cfg_group, group)) {
               int port_up;
               int check;
               misdn_cfg_get(port, MISDN_CFG_PMP_L1_CHECK, &check, sizeof(int));
               port_up = misdn_lib_port_up(port, check);

               chan_misdn_log(4, port, "portup:%d\n", port_up);

               if (port_up > 0) {
                  newbc = misdn_lib_get_free_bc(port, 0, 0, dec);
                  if (newbc)
                     break;
               }
            }
         }
      }
      
      /* Group dial failed ?*/
      if (!newbc) {
         ast_log(LOG_WARNING, 
               "Could not Dial out on group '%s'.\n"
               "\tEither the L2 and L1 on all of these ports where DOWN (see 'show application misdn_check_l2l1')\n"
               "\tOr there was no free channel on none of the ports\n\n"
               , group);
         return NULL;
      }
   } else {
      /* 'Normal' Port dial * Port dial */
      if (channel)
         chan_misdn_log(1, port, " --> preselected_channel: %d\n", channel);
      newbc = misdn_lib_get_free_bc(port, channel, 0, dec);

      if (!newbc) {
         ast_log(LOG_WARNING, "Could not create channel on port:%d with extensions:%s\n", port, ext);
         return NULL;
      }
   }
   

   /* create ast_channel and link all the objects together */
   cl = init_chan_list(ORG_AST);
   if (!cl) {
      ast_log(LOG_ERROR, "Could not create call record for Dial(%s)\n", dial_str);
      return NULL;
   }
   cl->bc = newbc;
   
   tmp = misdn_new(cl, AST_STATE_RESERVED, ext, NULL, format, port, channel);
   if (!tmp) {
      free(cl);
      ast_log(LOG_ERROR,"Could not create Asterisk object\n");
      return NULL;
   }

   cl->ast=tmp;
   
   /* register chan in local list */
   cl_queue_chan(&cl_te, cl) ;
   
   /* fill in the config into the objects */
   read_config(cl, ORG_AST);

   /* important */
   cl->need_hangup = 0;
   
   return tmp;
}


static int misdn_send_text(struct ast_channel *chan, const char *text)
{
   struct chan_list *tmp = chan->tech_pvt;
   
   if (tmp && tmp->bc) {
      ast_copy_string(tmp->bc->display, text, sizeof(tmp->bc->display));
      misdn_lib_send_event(tmp->bc, EVENT_INFORMATION);
   } else {
      ast_log(LOG_WARNING, "No chan_list but send_text request?\n");
      return -1;
   }
   
   return 0;
}

static struct ast_channel_tech misdn_tech = {
   .type = "mISDN",
   .description = "Channel driver for mISDN Support (Bri/Pri)",
   .capabilities = AST_FORMAT_ALAW ,
   .requester = misdn_request,
   .send_digit_begin = misdn_digit_begin,
   .send_digit_end = misdn_digit_end,
   .call = misdn_call,
   .bridge = misdn_bridge, 
   .hangup = misdn_hangup,
   .answer = misdn_answer,
   .read = misdn_read,
   .write = misdn_write,
   .indicate = misdn_indication,
   .fixup = misdn_fixup,
   .send_text = misdn_send_text,
   .properties = 0
};

static struct ast_channel_tech misdn_tech_wo_bridge = {
   .type = "mISDN",
   .description = "Channel driver for mISDN Support (Bri/Pri)",
   .capabilities = AST_FORMAT_ALAW ,
   .requester = misdn_request,
   .send_digit_begin = misdn_digit_begin,
   .send_digit_end = misdn_digit_end,
   .call = misdn_call,
   .hangup = misdn_hangup,
   .answer = misdn_answer,
   .read = misdn_read,
   .write = misdn_write,
   .indicate = misdn_indication,
   .fixup = misdn_fixup,
   .send_text = misdn_send_text,
   .properties = 0
};


static int glob_channel = 0;

static void update_name(struct ast_channel *tmp, int port, int c) 
{
   int chan_offset = 0;
   int tmp_port = misdn_cfg_get_next_port(0);
   for (; tmp_port > 0; tmp_port = misdn_cfg_get_next_port(tmp_port)) {
      if (tmp_port == port)
         break;
      chan_offset += misdn_lib_port_is_pri(tmp_port) ? 30 : 2; 
   }
   if (c < 0)
      c = 0;

   ast_string_field_build(tmp, name, "%s/%d-u%d",
      misdn_type, chan_offset + c, glob_channel++);

   chan_misdn_log(3, port, " --> updating channel name to [%s]\n", tmp->name);
}

static struct ast_channel *misdn_new(struct chan_list *chlist, int state,  char *exten, char *callerid, int format, int port, int c)
{
   struct ast_channel *tmp;
   char *cid_name = 0, *cid_num = 0;
   int chan_offset = 0;
   int tmp_port = misdn_cfg_get_next_port(0);
   int bridging;

   for (; tmp_port > 0; tmp_port = misdn_cfg_get_next_port(tmp_port)) {
      if (tmp_port == port)
         break;
      chan_offset += misdn_lib_port_is_pri(tmp_port) ? 30 : 2;
   }
   if (c < 0)
      c = 0;

   if (callerid) {
      ast_callerid_parse(callerid, &cid_name, &cid_num);
   }

   tmp = ast_channel_alloc(1, state, cid_num, cid_name, "", exten, "", 0, "%s/%d-u%d", misdn_type, chan_offset + c, glob_channel++);
   if (tmp) {
      chan_misdn_log(2, 0, " --> * NEW CHANNEL dad:%s oad:%s\n", exten, callerid);

      tmp->nativeformats = prefformat;

      tmp->readformat = format;
      tmp->rawreadformat = format;
      tmp->writeformat = format;
      tmp->rawwriteformat = format;
    
      tmp->tech_pvt = chlist;

      misdn_cfg_get(0, MISDN_GEN_BRIDGING, &bridging, sizeof(int));

      if (bridging)
         tmp->tech = &misdn_tech;
      else
         tmp->tech = &misdn_tech_wo_bridge;

      tmp->writeformat = format;
      tmp->readformat = format;
      tmp->priority=1;

      if (exten) 
         ast_copy_string(tmp->exten, exten, sizeof(tmp->exten));
      else
         chan_misdn_log(1, 0, "misdn_new: no exten given.\n");

      if (callerid)
         /* Don't use ast_set_callerid() here because it will
          * generate a needless NewCallerID event */
         tmp->cid.cid_ani = ast_strdup(cid_num);

      if (pipe(chlist->pipe) < 0)
         perror("Pipe failed\n");
      tmp->fds[0] = chlist->pipe[0];

      if (state == AST_STATE_RING)
         tmp->rings = 1;
      else
         tmp->rings = 0;
      
   } else {
      chan_misdn_log(-1, 0, "Unable to allocate channel structure\n");
   }
   
   return tmp;
}

static struct chan_list *find_chan_by_bc(struct chan_list *list, struct misdn_bchannel *bc)
{
   struct chan_list *help = list;
   for (; help; help = help->next) {
      if (help->bc == bc) return help;
   }

   chan_misdn_log(6, bc->port, "$$$ find_chan: No channel found for oad:%s dad:%s\n", bc->oad, bc->dad);

   return NULL;
}

static struct chan_list *find_chan_by_pid(struct chan_list *list, int pid)
{
   struct chan_list *help = list;
   for (; help; help = help->next) {
      if ( help->bc && (help->bc->pid == pid) ) return help;
   }

   chan_misdn_log(6, 0, "$$$ find_chan: No channel found for pid:%d\n", pid);

   return NULL;
}

static struct chan_list *find_hold_call(struct chan_list *list, struct misdn_bchannel *bc)
{
   struct chan_list *help = list;

   if (bc->pri) return NULL;

   chan_misdn_log(6, bc->port, "$$$ find_hold_call: channel:%d oad:%s dad:%s\n", bc->channel, bc->oad, bc->dad);
   for (;help; help = help->next) {
      chan_misdn_log(4, bc->port, "$$$ find_hold_call: --> hold:%d channel:%d\n", help->hold.state, help->hold.channel);
      if (help->hold.state == MISDN_HOLD_ACTIVE && help->hold.port == bc->port)
         return help;
   }
   chan_misdn_log(6, bc->port, "$$$ find_hold_call: No channel found for oad:%s dad:%s\n", bc->oad, bc->dad);

   return NULL;
}


static struct chan_list *find_hold_call_l3(struct chan_list *list, unsigned long l3_id)
{
   struct chan_list *help = list;

   for (; help; help = help->next) {
      if (help->hold.state != MISDN_HOLD_IDLE && help->l3id == l3_id)
         return help;
   }

   return NULL;
}

#define TRANSFER_ON_HELD_CALL_HANGUP 1
#if defined(TRANSFER_ON_HELD_CALL_HANGUP)
/*!
 * \internal
 * \brief Find a suitable active call to go with a held call so we could try a transfer.
 *
 * \param list Channel list.
 * \param bc B channel record.
 *
 * \return Found call record or NULL.
 *
 * \note There could be a possibility where we find the wrong active call to transfer.
 * This concern is mitigated by the fact that there could be at most one other call
 * on a PTMP BRI link to another device.  Maybe the l3_id could help in locating an
 * active call on the same TEI?
 */
static struct chan_list *find_hold_active_call(struct chan_list *list, struct misdn_bchannel *bc)
{
   for (; list; list = list->next) {
      if (list->hold.state == MISDN_HOLD_IDLE && list->bc && list->bc->port == bc->port
         && list->ast) {
         switch (list->state) {
         case MISDN_PROCEEDING:
         case MISDN_PROGRESS:
         case MISDN_ALERTING:
         case MISDN_CONNECTED:
            return list;
         default:
            break;
         }
      }
   }
   return NULL;
}
#endif   /* defined(TRANSFER_ON_HELD_CALL_HANGUP) */

static void cl_queue_chan(struct chan_list **list, struct chan_list *chan)
{
   chan_misdn_log(4, chan->bc ? chan->bc->port : 0, "* Queuing chan %p\n", chan);
  
   ast_mutex_lock(&cl_te_lock);
   if (!*list) {
      *list = chan;
   } else {
      struct chan_list *help = *list;
      for (; help->next; help = help->next); 
      help->next = chan;
   }
   chan->next = NULL;
   ast_mutex_unlock(&cl_te_lock);
}

static void cl_dequeue_chan(struct chan_list **list, struct chan_list *chan) 
{
   struct chan_list *help;

   if (chan->dsp) 
      ast_dsp_free(chan->dsp);

   ast_mutex_lock(&cl_te_lock);
   if (!*list) {
      ast_mutex_unlock(&cl_te_lock);
      return;
   }
  
   if (*list == chan) {
      *list = (*list)->next;
      ast_mutex_unlock(&cl_te_lock);
      return;
   }
  
   for (help = *list; help->next; help = help->next) {
      if (help->next == chan) {
         help->next = help->next->next;
         ast_mutex_unlock(&cl_te_lock);
         return;
      }
   }
   
   ast_mutex_unlock(&cl_te_lock);
}

/** Channel Queue End **/


static int pbx_start_chan(struct chan_list *ch)
{
   int ret = ast_pbx_start(ch->ast);   

   if (ret >= 0) 
      ch->need_hangup = 0;
   else
      ch->need_hangup = 1;

   return ret;
}

static void hangup_chan(struct chan_list *ch, struct misdn_bchannel *bc)
{
   int port;

   if (!ch) {
      cb_log(1, 0, "Cannot hangup chan, no ch\n");
      return;
   }

   port = bc->port;
   cb_log(5, port, "hangup_chan called\n");

   if (ch->need_hangup) {
      cb_log(2, port, " --> hangup\n");
      ch->need_hangup = 0;
      ch->need_queue_hangup = 0;
      if (ch->ast) {
         send_cause2ast(ch->ast, bc, ch);
         ast_hangup(ch->ast);
      }
      return;
   }

   if (!ch->need_queue_hangup) {
      cb_log(2, port, " --> No need to queue hangup\n");
   }

   ch->need_queue_hangup = 0;
   if (ch->ast) {
      send_cause2ast(ch->ast, bc, ch);
      ast_queue_hangup(ch->ast);
      cb_log(2, port, " --> queue_hangup\n");
   } else {
      cb_log(1, port, "Cannot hangup chan, no ast\n");
   }
}

/*!
 * \internal
 * \brief ISDN asked us to release channel, pendant to misdn_hangup.
 *
 * \param ch Call channel record to release.
 * \param bc Current B channel record associated with ch.
 *
 * \return Nothing
 *
 * \note ch must not be referenced after calling.
 */
static void release_chan(struct chan_list *ch, struct misdn_bchannel *bc)
{
   struct ast_channel *ast;

   ch->state = MISDN_CLEANING;

   ast_mutex_lock(&release_lock);

   cl_dequeue_chan(&cl_te, ch);

   chan_misdn_log(5, bc->port, "release_chan: bc with pid:%d l3id: %x\n", bc->pid, bc->l3_id);

   /* releasing jitterbuffer */
   if (ch->jb) {
      misdn_jb_destroy(ch->jb);
      ch->jb = NULL;
   } else {
      if (!bc->nojitter) {
         chan_misdn_log(5, bc->port, "Jitterbuffer already destroyed.\n");
      }
   }

   if (ch->overlap_dial) {
      if (ch->overlap_dial_task != -1) {
         misdn_tasks_remove(ch->overlap_dial_task);
         ch->overlap_dial_task = -1;
      }
      ast_mutex_destroy(&ch->overlap_tv_lock);
   }

   if (ch->originator == ORG_AST) {
      --misdn_out_calls[bc->port];
   } else {
      --misdn_in_calls[bc->port];
   }

   close(ch->pipe[0]);
   close(ch->pipe[1]);

   ast = ch->ast;
   if (ast) {
      MISDN_ASTERISK_TECH_PVT(ast) = NULL;
      chan_misdn_log(1, bc->port,
         "* RELEASING CHANNEL pid:%d ctx:%s dad:%s oad:%s\n",
         bc->pid,
         ast->context,
         ast->exten,
         ast->cid.cid_num);

      if (ast->_state != AST_STATE_RESERVED) {
         chan_misdn_log(3, bc->port, " --> Setting AST State to down\n");
         ast_setstate(ast, AST_STATE_DOWN);
      }
   }

   free(ch);

   ast_mutex_unlock(&release_lock);
}

/*!
 * \internal
 * \brief Do everything in release_chan() that makes sense without a bc.
 *
 * \param ch Call channel record to release.
 *
 * \return Nothing
 *
 * \note ch must not be referenced after calling.
 */
static void release_chan_early(struct chan_list *ch)
{
   struct ast_channel *ast;

   ch->state = MISDN_CLEANING;

   ast_mutex_lock(&release_lock);

   cl_dequeue_chan(&cl_te, ch);

   /* releasing jitterbuffer */
   if (ch->jb) {
      misdn_jb_destroy(ch->jb);
      ch->jb = NULL;
   }

   if (ch->overlap_dial) {
      if (ch->overlap_dial_task != -1) {
         misdn_tasks_remove(ch->overlap_dial_task);
         ch->overlap_dial_task = -1;
      }
      ast_mutex_destroy(&ch->overlap_tv_lock);
   }

   if (ch->hold.state != MISDN_HOLD_IDLE) {
      if (ch->originator == ORG_AST) {
         --misdn_out_calls[ch->hold.port];
      } else {
         --misdn_in_calls[ch->hold.port];
      }
   }

   close(ch->pipe[0]);
   close(ch->pipe[1]);

   ast = ch->ast;
   if (ast) {
      MISDN_ASTERISK_TECH_PVT(ast) = NULL;
      if (ast->_state != AST_STATE_RESERVED) {
         ast_setstate(ast, AST_STATE_DOWN);
      }
   }

   free(ch);

   ast_mutex_unlock(&release_lock);
}

/*!
 * \internal
 * \brief Attempt to transfer the active channel party to the held channel party.
 *
 * \param active_ch Channel currently connected.
 * \param held_ch Channel currently on hold.
 *
 * \retval 0 on success.
 * \retval -1 on error.
 */
static int misdn_attempt_transfer(struct chan_list *active_ch, struct chan_list *held_ch)
{
   int retval;
   struct ast_channel *bridged;

   switch (active_ch->state) {
   case MISDN_PROCEEDING:
   case MISDN_PROGRESS:
   case MISDN_ALERTING:
   case MISDN_CONNECTED:
      break;
   default:
      return -1;
   }

   bridged = ast_bridged_channel(held_ch->ast);
   if (bridged) {
      ast_queue_control(held_ch->ast, AST_CONTROL_UNHOLD);
      held_ch->hold.state = MISDN_HOLD_TRANSFER;

      chan_misdn_log(1, held_ch->hold.port, "TRANSFERRING %s to %s\n",
         held_ch->ast->name, active_ch->ast->name);
      retval = ast_channel_masquerade(active_ch->ast, bridged);
   } else {
      /*
       * Could not transfer.  Held channel is not bridged anymore.
       * Held party probably got tired of waiting and hung up.
       */
      retval = -1;
   }

   return retval;
}


static void do_immediate_setup(struct misdn_bchannel *bc, struct chan_list *ch, struct ast_channel *ast)
{
   char predial[256]="";
   char *p = predial;
  
   struct ast_frame fr;

   strncpy(predial, ast->exten, sizeof(predial) -1 );

   ch->state = MISDN_DIALING;

   if (!ch->noautorespond_on_setup) {
      if (bc->nt) {
         int ret; 
         ret = misdn_lib_send_event(bc, EVENT_SETUP_ACKNOWLEDGE );
      } else {
         int ret;
         if ( misdn_lib_is_ptp(bc->port)) {
            ret = misdn_lib_send_event(bc, EVENT_SETUP_ACKNOWLEDGE );
         } else {
            ret = misdn_lib_send_event(bc, EVENT_PROCEEDING );
         }
      }
   } else {
      ch->state = MISDN_INCOMING_SETUP;
   }

   chan_misdn_log(1, bc->port, "* Starting Ast ctx:%s dad:%s oad:%s with 's' extension\n", ast->context, ast->exten, ast->cid.cid_num);
  
   strcpy(ast->exten, "s");
 
   if (!ast_canmatch_extension(ast, ast->context, ast->exten, 1, bc->oad) || pbx_start_chan(ch) < 0) {
      ast = NULL;
      bc->out_cause = AST_CAUSE_UNALLOCATED;
      hangup_chan(ch, bc);
      hanguptone_indicate(ch);

      if (bc->nt)
         misdn_lib_send_event(bc, EVENT_RELEASE_COMPLETE );
      else
         misdn_lib_send_event(bc, EVENT_DISCONNECT );
   }
  
  
   while (!ast_strlen_zero(p) ) {
      fr.frametype = AST_FRAME_DTMF;
      fr.subclass = *p;
      fr.src = NULL;
      fr.data = NULL;
      fr.datalen = 0;
      fr.samples = 0;
      fr.mallocd = 0;
      fr.offset = 0;
      fr.delivery = ast_tv(0,0);

      if (ch->ast && MISDN_ASTERISK_PVT(ch->ast) && MISDN_ASTERISK_TECH_PVT(ch->ast)) {
         ast_queue_frame(ch->ast, &fr);
      }
      p++;
   }
}



static void send_cause2ast(struct ast_channel *ast, struct misdn_bchannel *bc, struct chan_list *ch) {
   if (!ast) {
      chan_misdn_log(1, 0, "send_cause2ast: No Ast\n");
      return;
   }
   if (!bc) {
      chan_misdn_log(1, 0, "send_cause2ast: No BC\n");
      return;
   }
   if (!ch) {
      chan_misdn_log(1, 0, "send_cause2ast: No Ch\n");
      return;
   }

   ast->hangupcause = bc->cause;

   switch (bc->cause) {

   case AST_CAUSE_UNALLOCATED:
   case AST_CAUSE_NO_ROUTE_TRANSIT_NET:
   case AST_CAUSE_NO_ROUTE_DESTINATION:
   case 4:  /* Send special information tone */
   case AST_CAUSE_NUMBER_CHANGED:
   case AST_CAUSE_DESTINATION_OUT_OF_ORDER:
      /* Congestion Cases */
      /*
       * Not Queueing the Congestion anymore, since we want to hear
       * the inband message
       *
      chan_misdn_log(1, bc ? bc->port : 0, " --> * SEND: Queue Congestion pid:%d\n", bc ? bc->pid : -1);
      ch->state = MISDN_BUSY;
      
      ast_queue_control(ast, AST_CONTROL_CONGESTION);
      */
      break;

   case AST_CAUSE_CALL_REJECTED:
   case AST_CAUSE_USER_BUSY:
      ch->state = MISDN_BUSY;

      if (!ch->need_busy) {
         chan_misdn_log(1, bc ? bc->port : 0, "Queued busy already\n");
         break;
      }

      chan_misdn_log(1, bc ? bc->port : 0, " --> * SEND: Queue Busy pid:%d\n", bc ? bc->pid : -1);
      
      ast_queue_control(ast, AST_CONTROL_BUSY);
      
      ch->need_busy = 0;
      
      break;
   }
}


/*! \brief Import parameters from the dialplan environment variables */
void import_ch(struct ast_channel *chan, struct misdn_bchannel *bc, struct chan_list *ch)
{
   const char *tmp;

   tmp = pbx_builtin_getvar_helper(chan, "MISDN_PID");
   if (tmp) {
      ch->other_pid = atoi(tmp);
      chan_misdn_log(3, bc->port, " --> IMPORT_PID: importing pid:%s\n", tmp);
      if (ch->other_pid > 0) {
         ch->other_ch = find_chan_by_pid(cl_te, ch->other_pid);
         if (ch->other_ch)
            ch->other_ch->other_ch = ch;
      }
   }

   tmp = pbx_builtin_getvar_helper(chan, "MISDN_ADDRESS_COMPLETE");
   if (tmp && (atoi(tmp) == 1)) {
      bc->sending_complete = 1;
   }

   tmp = pbx_builtin_getvar_helper(chan, "MISDN_USERUSER");
   if (tmp) {
      ast_log(LOG_NOTICE, "MISDN_USERUSER: %s\n", tmp);
      ast_copy_string(bc->uu, tmp, sizeof(bc->uu));
      bc->uulen = strlen(bc->uu);
   }

   tmp = pbx_builtin_getvar_helper(chan, "MISDN_KEYPAD");
   if (tmp) {
      ast_copy_string(bc->keypad, tmp, sizeof(bc->keypad));
   }
}

/*! \brief Export parameters to the dialplan environment variables */
void export_ch(struct ast_channel *chan, struct misdn_bchannel *bc, struct chan_list *ch)
{
   char tmp[32];
   chan_misdn_log(3, bc->port, " --> EXPORT_PID: pid:%d\n", bc->pid);
   snprintf(tmp, sizeof(tmp), "%d", bc->pid);
   pbx_builtin_setvar_helper(chan, "_MISDN_PID", tmp);

   if (bc->sending_complete) {
      snprintf(tmp, sizeof(tmp), "%d", bc->sending_complete);
      pbx_builtin_setvar_helper(chan, "MISDN_ADDRESS_COMPLETE", tmp);
   }

   if (bc->urate) {
      snprintf(tmp, sizeof(tmp), "%d", bc->urate);
      pbx_builtin_setvar_helper(chan, "MISDN_URATE", tmp);
   }

   if (bc->uulen && (bc->uulen < sizeof(bc->uu))) {
      bc->uu[bc->uulen] = 0;
      pbx_builtin_setvar_helper(chan, "MISDN_USERUSER", bc->uu);
   }

   if (!ast_strlen_zero(bc->keypad)) 
      pbx_builtin_setvar_helper(chan, "MISDN_KEYPAD", bc->keypad);
}

int add_in_calls(int port)
{
   int max_in_calls;
   
   misdn_cfg_get(port, MISDN_CFG_MAX_IN, &max_in_calls, sizeof(max_in_calls));
   misdn_in_calls[port]++;

   if (max_in_calls >= 0 && max_in_calls < misdn_in_calls[port]) {
      ast_log(LOG_NOTICE, "Marking Incoming Call on port[%d]\n", port);
      return misdn_in_calls[port] - max_in_calls;
   }
   
   return 0;
}

int add_out_calls(int port)
{
   int max_out_calls;
   
   misdn_cfg_get(port, MISDN_CFG_MAX_OUT, &max_out_calls, sizeof(max_out_calls));

   if (max_out_calls >= 0 && max_out_calls <= misdn_out_calls[port]) {
      ast_log(LOG_NOTICE, "Rejecting Outgoing Call on port[%d]\n", port);
      return (misdn_out_calls[port] + 1) - max_out_calls;
   }

   misdn_out_calls[port]++;
   
   return 0;
}

static void start_pbx(struct chan_list *ch, struct misdn_bchannel *bc, struct ast_channel *chan) {
   if (pbx_start_chan(ch) < 0) {
      hangup_chan(ch, bc);
      chan_misdn_log(-1, bc->port, "ast_pbx_start returned <0 in SETUP\n");
      if (bc->nt) {
         hanguptone_indicate(ch);
         misdn_lib_send_event(bc, EVENT_RELEASE_COMPLETE);
      } else
         misdn_lib_send_event(bc, EVENT_RELEASE);
   }
}

static void wait_for_digits(struct chan_list *ch, struct misdn_bchannel *bc, struct ast_channel *chan) {
   ch->state=MISDN_WAITING4DIGS;
   misdn_lib_send_event(bc, EVENT_SETUP_ACKNOWLEDGE );
   if (bc->nt && !bc->dad[0])
      dialtone_indicate(ch);
}


/************************************************************/
/*  Receive Events from isdn_lib  here                     */
/************************************************************/
static enum event_response_e
cb_events(enum event_e event, struct misdn_bchannel *bc, void *user_data)
{
   int msn_valid;
   struct chan_list *held_ch;
   struct chan_list *ch = find_chan_by_bc(cl_te, bc);
   
   if (event != EVENT_BCHAN_DATA && event != EVENT_TONE_GENERATE) { /*  Debug Only Non-Bchan */
      int debuglevel = 1;
      if ( event == EVENT_CLEANUP && !user_data)
         debuglevel = 5;

      chan_misdn_log(debuglevel, bc->port, "I IND :%s oad:%s dad:%s pid:%d state:%s\n", manager_isdn_get_info(event), bc->oad, bc->dad, bc->pid, ch ? misdn_get_ch_state(ch) : "none");
      if (debuglevel == 1) {
         misdn_lib_log_ies(bc);
         chan_misdn_log(4, bc->port, " --> bc_state:%s\n", bc_state2str(bc->bc_state));
      }
   }
   
   if (!ch) {
      switch(event) {
      case EVENT_SETUP:
      case EVENT_DISCONNECT:
      case EVENT_RELEASE:
      case EVENT_RELEASE_COMPLETE:
      case EVENT_PORT_ALARM:
      case EVENT_RETRIEVE:
      case EVENT_NEW_BC:
      case EVENT_FACILITY:
         break;
      case EVENT_CLEANUP:
      case EVENT_TONE_GENERATE:
      case EVENT_BCHAN_DATA:
         return -1;
      default:
         chan_misdn_log(1, bc->port, "Chan not existing at the moment bc->l3id:%x bc:%p event:%s port:%d channel:%d\n", bc->l3_id, bc, manager_isdn_get_info(event), bc->port, bc->channel);
         return -1;
      }
   }
   
   if (ch) {
      switch (event) {
      case EVENT_TONE_GENERATE:
         break;
      case EVENT_DISCONNECT:
      case EVENT_RELEASE:
      case EVENT_RELEASE_COMPLETE:
      case EVENT_CLEANUP:
      case EVENT_TIMEOUT:
         if (!ch->ast)
            chan_misdn_log(3, bc->port, "ast_hangup already called, so we have no ast ptr anymore in event(%s)\n", manager_isdn_get_info(event));
         break;
      default:
         if (!ch->ast  || !MISDN_ASTERISK_PVT(ch->ast) || !MISDN_ASTERISK_TECH_PVT(ch->ast)) {
            if (event != EVENT_BCHAN_DATA)
               ast_log(LOG_NOTICE, "No Ast or No private Pointer in Event (%d:%s)\n", event, manager_isdn_get_info(event));
            return -1;
         }
      }
   }
   
   
   switch (event) {
   case EVENT_PORT_ALARM:
      {
         int boa = 0;
         misdn_cfg_get(bc->port, MISDN_CFG_ALARM_BLOCK, &boa, sizeof(int));
         if (boa) {
            cb_log(1, bc->port, " --> blocking\n");
            misdn_lib_port_block(bc->port); 
         }
      }
      break;
   case EVENT_BCHAN_ACTIVATED:
      break;
      
   case EVENT_NEW_CHANNEL:
      update_name(ch->ast,bc->port,bc->channel);
      break;
      
   case EVENT_NEW_L3ID:
      ch->l3id=bc->l3_id;
      ch->addr=bc->addr;
      break;

   case EVENT_NEW_BC:
      if (!ch) {
         ch = find_hold_call(cl_te,bc);
      }
      
      if (!ch) {
         ast_log(LOG_WARNING, "NEW_BC without chan_list?\n");
         break;
      }

      if (bc)
         ch->bc = (struct misdn_bchannel *)user_data;
      break;
      
   case EVENT_DTMF_TONE:
   {
      /*  sending INFOS as DTMF-Frames :) */
      struct ast_frame fr;

      memset(&fr, 0, sizeof(fr));
      fr.frametype = AST_FRAME_DTMF;
      fr.subclass = bc->dtmf ;
      fr.src = NULL;
      fr.data = NULL;
      fr.datalen = 0;
      fr.samples = 0;
      fr.mallocd = 0;
      fr.offset = 0;
      fr.delivery = ast_tv(0,0);
      
      if (!ch->ignore_dtmf) {
         chan_misdn_log(2, bc->port, " --> DTMF:%c\n", bc->dtmf);
         ast_queue_frame(ch->ast, &fr);
      } else {
         chan_misdn_log(2, bc->port, " --> Ignoring DTMF:%c due to bridge flags\n", bc->dtmf);
      }
   }
      break;
   case EVENT_STATUS:
      break;
    
   case EVENT_INFORMATION:
   {
      if ( ch->state != MISDN_CONNECTED ) 
         stop_indicate(ch);
   
      if (!ch->ast)
         break;

      if (ch->state == MISDN_WAITING4DIGS ) {
         /*  Ok, incomplete Setup, waiting till extension exists */
         if (ast_strlen_zero(bc->info_dad) && ! ast_strlen_zero(bc->keypad)) {
            chan_misdn_log(1, bc->port, " --> using keypad as info\n");
            ast_copy_string(bc->info_dad, bc->keypad, sizeof(bc->info_dad));
         }

         strncat(bc->dad, bc->info_dad, sizeof(bc->dad) - strlen(bc->dad) - 1);
         ast_copy_string(ch->ast->exten, bc->dad, sizeof(ch->ast->exten));

         /* Check for Pickup Request first */
         if (!strcmp(ch->ast->exten, ast_pickup_ext())) {
            if (ast_pickup_call(ch->ast)) {
               hangup_chan(ch, bc);
            } else {
               struct ast_channel *chan = ch->ast;
               ch->state = MISDN_CALLING_ACKNOWLEDGE;
               ast_setstate(chan, AST_STATE_DOWN);
               hangup_chan(ch, bc);
               ch->ast = NULL;
               break;
            }
         }
         
         if (!ast_canmatch_extension(ch->ast, ch->context, bc->dad, 1, bc->oad)) {
            if (ast_exists_extension(ch->ast, ch->context, "i", 1, bc->oad)) {
               ast_log(LOG_WARNING,
                  "Extension '%s@%s' can never match. Jumping to 'i' extension. port:%d\n",
                  bc->dad, ch->context, bc->port);
               strcpy(ch->ast->exten, "i");

               ch->state = MISDN_DIALING;
               start_pbx(ch, bc, ch->ast);
               break;
            }

            ast_log(LOG_WARNING,
               "Extension '%s@%s' can never match. Disconnecting. port:%d\n"
               "\tMaybe you want to add an 'i' extension to catch this case.\n",
               bc->dad, ch->context, bc->port);

            if (bc->nt)
               hanguptone_indicate(ch);
            ch->state = MISDN_EXTCANTMATCH;
            bc->out_cause = AST_CAUSE_UNALLOCATED;

            misdn_lib_send_event(bc, EVENT_DISCONNECT);
            break;
         }

         if (ch->overlap_dial) {
            ast_mutex_lock(&ch->overlap_tv_lock);
            ch->overlap_tv = ast_tvnow();
            ast_mutex_unlock(&ch->overlap_tv_lock);
            if (ch->overlap_dial_task == -1) {
               ch->overlap_dial_task = 
                  misdn_tasks_add_variable(ch->overlap_dial, misdn_overlap_dial_task, ch);
            }
            break;
         }

         if (ast_exists_extension(ch->ast, ch->context, bc->dad, 1, bc->oad))  {
            
            ch->state = MISDN_DIALING;
            start_pbx(ch, bc, ch->ast);
         }
      } else {
         /*  sending INFOS as DTMF-Frames :) */
         struct ast_frame fr;
         int digits;

         memset(&fr, 0, sizeof(fr));
         fr.frametype = AST_FRAME_DTMF;
         fr.subclass = bc->info_dad[0] ;
         fr.src = NULL;
         fr.data = NULL;
         fr.datalen = 0;
         fr.samples = 0;
         fr.mallocd = 0;
         fr.offset = 0;
         fr.delivery = ast_tv(0,0);

         misdn_cfg_get(0, MISDN_GEN_APPEND_DIGITS2EXTEN, &digits, sizeof(int));
         if (ch->state != MISDN_CONNECTED ) {
            if (digits) {
               strncat(bc->dad, bc->info_dad, sizeof(bc->dad) - strlen(bc->dad) - 1);
               ast_copy_string(ch->ast->exten, bc->dad, sizeof(ch->ast->exten));
               ast_cdr_update(ch->ast);
            }
            
            ast_queue_frame(ch->ast, &fr);
         }
      }
   }
      break;
   case EVENT_SETUP:
   {
      struct chan_list *ch = find_chan_by_bc(cl_te, bc);
      struct ast_channel *chan;
      int exceed;
      int pres, screen;
      int ai;
      int im;

      if (ch) {
         switch (ch->state) {
         case MISDN_NOTHING:
            ch = NULL;
            break;
         default:
            chan_misdn_log(1, bc->port, " --> Ignoring Call we have already one\n");
            return RESPONSE_IGNORE_SETUP_WITHOUT_CLOSE; /*  Ignore MSNs which are not in our List */
         }
      }

      msn_valid = misdn_cfg_is_msn_valid(bc->port, bc->dad);
      if (!bc->nt && ! msn_valid) {
         chan_misdn_log(1, bc->port, " --> Ignoring Call, its not in our MSN List\n");
         return RESPONSE_IGNORE_SETUP; /*  Ignore MSNs which are not in our List */
      }

      if (bc->cw) {
         int cause;
         chan_misdn_log(0, bc->port, " --> Call Waiting on PMP sending RELEASE_COMPLETE\n");
         misdn_cfg_get(bc->port, MISDN_CFG_REJECT_CAUSE, &cause, sizeof(cause));
         bc->out_cause = cause ? cause : AST_CAUSE_NORMAL_CLEARING;
         return RESPONSE_RELEASE_SETUP;
      }

      print_bearer(bc);

      ch = init_chan_list(ORG_MISDN);

      if (!ch) {
         chan_misdn_log(-1, bc->port, "cb_events: malloc for chan_list failed!\n");
         return 0;
      }

      ch->bc = bc;
      ch->l3id = bc->l3_id;
      ch->addr = bc->addr;
      ch->originator = ORG_MISDN;

      chan = misdn_new(ch, AST_STATE_RESERVED, bc->dad, bc->oad, AST_FORMAT_ALAW, bc->port, bc->channel);
      if (!chan) {
         free(ch);
         misdn_lib_send_event(bc,EVENT_RELEASE_COMPLETE);
         ast_log(LOG_ERROR, "cb_events: misdn_new failed !\n"); 
         return 0;
      }

      ch->ast = chan;

      if ((exceed = add_in_calls(bc->port))) {
         char tmp[16];
         snprintf(tmp, sizeof(tmp), "%d", exceed);
         pbx_builtin_setvar_helper(chan, "MAX_OVERFLOW", tmp);
      }

      read_config(ch, ORG_MISDN);

      export_ch(chan, bc, ch);

      ch->ast->rings = 1;
      ast_setstate(ch->ast, AST_STATE_RINGING);

      switch (bc->pres) {
      case 1:
         pres = AST_PRES_RESTRICTED;
         chan_misdn_log(2, bc->port, " --> PRES: Restricted (1)\n");
         break;
      case 2:
         pres = AST_PRES_UNAVAILABLE;
         chan_misdn_log(2, bc->port, " --> PRES: Unavailable (2)\n");
         break;
      default:
         pres = AST_PRES_ALLOWED;
         chan_misdn_log(2, bc->port, " --> PRES: Allowed (%d)\n", bc->pres);
         break;
      }

      switch (bc->screen) {
      default:
      case 0:
         screen = AST_PRES_USER_NUMBER_UNSCREENED;
         chan_misdn_log(2, bc->port, " --> SCREEN: Unscreened (%d)\n", bc->screen);
         break;
      case 1:
         screen = AST_PRES_USER_NUMBER_PASSED_SCREEN;
         chan_misdn_log(2, bc->port, " --> SCREEN: Passed screen (1)\n");
         break;
      case 2:
         screen = AST_PRES_USER_NUMBER_FAILED_SCREEN;
         chan_misdn_log(2, bc->port, " --> SCREEN: failed screen (2)\n");
         break;
      case 3:
         screen = AST_PRES_NETWORK_NUMBER;
         chan_misdn_log(2, bc->port, " --> SCREEN: Network Number (3)\n");
         break;
      }

      chan->cid.cid_pres = pres | screen;

      pbx_builtin_setvar_helper(chan, "TRANSFERCAPABILITY", ast_transfercapability2str(bc->capability));
      chan->transfercapability = bc->capability;

      switch (bc->capability) {
      case INFO_CAPABILITY_DIGITAL_UNRESTRICTED:
         pbx_builtin_setvar_helper(chan, "CALLTYPE", "DIGITAL");
         break;
      default:
         pbx_builtin_setvar_helper(chan, "CALLTYPE", "SPEECH");
      }

      /** queue new chan **/
      cl_queue_chan(&cl_te, ch);

      if (!strstr(ch->allowed_bearers, "all")) {
         int i;

         for (i = 0; i < ARRAY_LEN(allowed_bearers_array); ++i) {
            if (allowed_bearers_array[i].cap == bc->capability) {
               if (strstr(ch->allowed_bearers, allowed_bearers_array[i].name)) {
                  /* The bearer capability is allowed */
                  if (allowed_bearers_array[i].deprecated) {
                     chan_misdn_log(0, bc->port, "%s in allowed_bearers list is deprecated\n",
                        allowed_bearers_array[i].name);
                  }
                  break;
               }
            }
         }  /* end for */
         if (i == ARRAY_LEN(allowed_bearers_array)) {
            /* We did not find the bearer capability */
            chan_misdn_log(0, bc->port, "Bearer capability not allowed: %s(%d)\n",
               bearer2str(bc->capability), bc->capability);
            bc->out_cause = AST_CAUSE_INCOMPATIBLE_DESTINATION;

            ch->state = MISDN_EXTCANTMATCH;
            misdn_lib_send_event(bc, EVENT_RELEASE_COMPLETE);
            return RESPONSE_OK;
         }
      }

      /* Check for Pickup Request first */
      if (!strcmp(chan->exten, ast_pickup_ext())) {
         if (!ch->noautorespond_on_setup) {
            int ret;/** Sending SETUP_ACK**/
            ret = misdn_lib_send_event(bc, EVENT_SETUP_ACKNOWLEDGE );
         } else {
            ch->state = MISDN_INCOMING_SETUP;
         }
         if (ast_pickup_call(chan)) {
            hangup_chan(ch, bc);
         } else {
            ch->state = MISDN_CALLING_ACKNOWLEDGE;
            ast_setstate(chan, AST_STATE_DOWN);
            hangup_chan(ch, bc);
            ch->ast = NULL;
            break;
         }
      }

      /*
       * added support for s extension hope it will help those poor cretains
       * which haven't overlap dial.
       */
      misdn_cfg_get(bc->port, MISDN_CFG_ALWAYS_IMMEDIATE, &ai, sizeof(ai));
      if (ai) {
         do_immediate_setup(bc, ch, chan);
         break;
      }

      /* check if we should jump into s when we have no dad */
      misdn_cfg_get(bc->port, MISDN_CFG_IMMEDIATE, &im, sizeof(im));
      if (im && ast_strlen_zero(bc->dad)) {
         do_immediate_setup(bc, ch, chan);
         break;
      }

      chan_misdn_log(5, bc->port, "CONTEXT:%s\n", ch->context);
      if(!ast_canmatch_extension(ch->ast, ch->context, bc->dad, 1, bc->oad)) {
         if (ast_exists_extension(ch->ast, ch->context, "i", 1, bc->oad)) {
            ast_log(LOG_WARNING,
               "Extension '%s@%s' can never match. Jumping to 'i' extension. port:%d\n",
               bc->dad, ch->context, bc->port);
            strcpy(ch->ast->exten, "i");
            misdn_lib_send_event(bc, EVENT_SETUP_ACKNOWLEDGE);
            ch->state = MISDN_DIALING;
            start_pbx(ch, bc, chan);
            break;
         }

         ast_log(LOG_WARNING,
            "Extension '%s@%s' can never match. Disconnecting. port:%d\n"
            "\tMaybe you want to add an 'i' extension to catch this case.\n",
            bc->dad, ch->context, bc->port);
         if (bc->nt)
            hanguptone_indicate(ch);

         ch->state = MISDN_EXTCANTMATCH;
         bc->out_cause = AST_CAUSE_UNALLOCATED;

         if (bc->nt)
            misdn_lib_send_event(bc, EVENT_RELEASE_COMPLETE );
         else
            misdn_lib_send_event(bc, EVENT_RELEASE );

         break;
      }

      /* Whatever happens, when sending_complete is set or we are PTMP TE, we will definitely 
       * jump into the dialplan, when the dialed extension does not exist, the 's' extension 
       * will be used by Asterisk automatically. */
      if (bc->sending_complete || (!bc->nt && !misdn_lib_is_ptp(bc->port))) {
         if (!ch->noautorespond_on_setup) {
            ch->state=MISDN_DIALING;
            misdn_lib_send_event(bc, EVENT_PROCEEDING );
         } else {
            ch->state = MISDN_INCOMING_SETUP;
         }
         start_pbx(ch, bc, chan);
         break;
      }


      /*
       * When we are NT and overlapdial is set and if 
       * the number is empty, we wait for the ISDN timeout
       * instead of our own timer.
       */
      if (ch->overlap_dial && bc->nt && !bc->dad[0] ) {
         wait_for_digits(ch, bc, chan);
         break;
      }

      /* 
       * If overlapdial we will definitely send a SETUP_ACKNOWLEDGE and wait for more 
       * Infos with a Interdigit Timeout.
       * */
      if (ch->overlap_dial) {
         ast_mutex_lock(&ch->overlap_tv_lock);
         ch->overlap_tv = ast_tvnow();
         ast_mutex_unlock(&ch->overlap_tv_lock);

         wait_for_digits(ch, bc, chan);
         if (ch->overlap_dial_task == -1) 
            ch->overlap_dial_task = 
               misdn_tasks_add_variable(ch->overlap_dial, misdn_overlap_dial_task, ch);

         break;
      }

      /* If the extension does not exist and we're not TE_PTMP we wait for more digits 
       * without interdigit timeout.
       * */
      if (!ast_exists_extension(ch->ast, ch->context, bc->dad, 1, bc->oad))  {
         wait_for_digits(ch, bc, chan);
         break;
      }

      /*
       * If the extension exists let's just jump into it.
       * */
      if (ast_exists_extension(ch->ast, ch->context, bc->dad, 1, bc->oad)) {
         if (bc->need_more_infos)
            misdn_lib_send_event(bc, EVENT_SETUP_ACKNOWLEDGE );
         else
            misdn_lib_send_event(bc, EVENT_PROCEEDING);

         ch->state = MISDN_DIALING;
         start_pbx(ch, bc, chan);
         break;
      }
   }
   break;

   case EVENT_SETUP_ACKNOWLEDGE:
   {
      ch->state = MISDN_CALLING_ACKNOWLEDGE;

      if (bc->channel) 
         update_name(ch->ast,bc->port,bc->channel);
      
      if (!ast_strlen_zero(bc->infos_pending)) {
         /* TX Pending Infos */
         strncat(bc->dad, bc->infos_pending, sizeof(bc->dad) - strlen(bc->dad) - 1);

         if (!ch->ast)
            break;
         ast_copy_string(ch->ast->exten, bc->dad, sizeof(ch->ast->exten));
         ast_copy_string(bc->info_dad, bc->infos_pending, sizeof(bc->info_dad));
         ast_copy_string(bc->infos_pending, "", sizeof(bc->infos_pending));

         misdn_lib_send_event(bc, EVENT_INFORMATION);
      }
   }
   break;
   case EVENT_PROCEEDING:
   {
      if (bc->channel) 
         update_name(ch->ast, bc->port, bc->channel);

      if (misdn_cap_is_speech(bc->capability) &&
           misdn_inband_avail(bc) ) {
         start_bc_tones(ch);
      }

      ch->state = MISDN_PROCEEDING;
      
      if (!ch->ast)
         break;

      ast_queue_control(ch->ast, AST_CONTROL_PROCEEDING);
   }
   break;
   case EVENT_PROGRESS:
      if (bc->channel) 
         update_name(ch->ast, bc->port, bc->channel);

      if (!bc->nt ) {
         if ( misdn_cap_is_speech(bc->capability) &&
              misdn_inband_avail(bc)
            ) {
            start_bc_tones(ch);
         }
         
         ch->state = MISDN_PROGRESS;

         if (!ch->ast)
            break;
         ast_queue_control(ch->ast, AST_CONTROL_PROGRESS);
      }
      break;
      
      
   case EVENT_ALERTING:
   {
      if (bc->channel) 
         update_name(ch->ast, bc->port, bc->channel);

      ch->state = MISDN_ALERTING;
      
      if (!ch->ast)
         break;

      ast_queue_control(ch->ast, AST_CONTROL_RINGING);
      ast_setstate(ch->ast, AST_STATE_RINGING);
      
      cb_log(7, bc->port, " --> Set State Ringing\n");
      
      if (misdn_cap_is_speech(bc->capability) && misdn_inband_avail(bc)) {
         cb_log(1, bc->port, "Starting Tones, we have inband Data\n");
         start_bc_tones(ch);
      } else {
         cb_log(3, bc->port, " --> We have no inband Data, the other end must create ringing\n");
         if (ch->far_alerting) {
            cb_log(1, bc->port, " --> The other end can not do ringing eh ?.. we must do all ourself..");
            start_bc_tones(ch);
            /*tone_indicate(ch, TONE_FAR_ALERTING);*/
         }
      }
   }
   break;
   case EVENT_CONNECT:
   {
      struct ast_channel *bridged;

      /*we answer when we've got our very new L3 ID from the NT stack */
      misdn_lib_send_event(bc, EVENT_CONNECT_ACKNOWLEDGE);

      if (!ch->ast)
         break;

      bridged = ast_bridged_channel(ch->ast);
      stop_indicate(ch);

      if (bridged && !strcasecmp(bridged->tech->type, "mISDN")) {
         struct chan_list *bridged_ch = MISDN_ASTERISK_TECH_PVT(bridged);

         chan_misdn_log(1, bc->port, " --> copying cpndialplan:%d and cad:%s to the A-Channel\n", bc->cpnnumplan, bc->cad);
         if (bridged_ch) {
            bridged_ch->bc->cpnnumplan = bc->cpnnumplan;
            ast_copy_string(bridged_ch->bc->cad, bc->cad, sizeof(bridged_ch->bc->cad));
         }
      }
   }
   ch->l3id=bc->l3_id;
   ch->addr=bc->addr;

   start_bc_tones(ch);
   
   ch->state = MISDN_CONNECTED;
   
   ast_queue_control(ch->ast, AST_CONTROL_ANSWER);
   break;
   case EVENT_CONNECT_ACKNOWLEDGE:
   {
      ch->l3id = bc->l3_id;
      ch->addr = bc->addr;

      start_bc_tones(ch);

      ch->state = MISDN_CONNECTED;
   }
   break;
   case EVENT_DISCONNECT:
      /*we might not have an ch->ast ptr here anymore*/
      if (ch) {
         chan_misdn_log(3, bc->port, " --> org:%d nt:%d, inbandavail:%d state:%d\n", ch->originator, bc->nt, misdn_inband_avail(bc), ch->state);
         if (ch->originator == ORG_AST && !bc->nt && misdn_inband_avail(bc) && ch->state != MISDN_CONNECTED) {
            /* If there's inband information available (e.g. a
               recorded message saying what was wrong with the
               dialled number, or perhaps even giving an
               alternative number, then play it instead of
               immediately releasing the call */
            chan_misdn_log(1, bc->port, " --> Inband Info Avail, not sending RELEASE\n");
      
            ch->state = MISDN_DISCONNECTED;
            start_bc_tones(ch);

            if (ch->ast) {
               ch->ast->hangupcause = bc->cause;
               if (bc->cause == AST_CAUSE_USER_BUSY)
                  ast_queue_control(ch->ast, AST_CONTROL_BUSY);
            }
            ch->need_busy = 0;
            break;
         }

         bc->need_disconnect = 0;
         stop_bc_tones(ch);

         /* Check for held channel, to implement transfer */
         held_ch = find_hold_call(cl_te, bc);
         if (!held_ch || !ch->ast || misdn_attempt_transfer(ch, held_ch)) {
            hangup_chan(ch, bc);
         }
      } else {
         held_ch = find_hold_call_l3(cl_te, bc->l3_id);
         if (held_ch && held_ch->hold.state == MISDN_HOLD_ACTIVE) {
            bc->need_disconnect = 0;

#if defined(TRANSFER_ON_HELD_CALL_HANGUP)
            /*
             * Some phones disconnect the held call and the active call at the
             * same time to do the transfer.  Unfortunately, either call could
             * be disconnected first.
             */
            ch = find_hold_active_call(cl_te, bc);
            if (!ch || misdn_attempt_transfer(ch, held_ch)) {
               held_ch->hold.state = MISDN_HOLD_DISCONNECT;
               hangup_chan(held_ch, bc);
            }
#else
            hangup_chan(held_ch, bc);
#endif   /* defined(TRANSFER_ON_HELD_CALL_HANGUP) */
         }
      }
      bc->out_cause = -1;
      if (bc->need_release)
         misdn_lib_send_event(bc, EVENT_RELEASE);
      break;
   
   case EVENT_RELEASE:
      if (!ch) {
         ch = find_hold_call_l3(cl_te, bc->l3_id);
         if (!ch) {
            chan_misdn_log(1, bc->port,
               " --> no Ch, so we've already released. (%s)\n",
               manager_isdn_get_info(event));
            return -1;
         }
      }

      bc->need_disconnect = 0;
      bc->need_release = 0;

      hangup_chan(ch, bc);
      release_chan(ch, bc);
      break;
   case EVENT_RELEASE_COMPLETE:
      if (!ch) {
         ch = find_hold_call_l3(cl_te, bc->l3_id);
         if (!ch) {
            chan_misdn_log(1, bc->port,
               " --> no Ch, so we've already released. (%s)\n",
               manager_isdn_get_info(event));
            break;
         }
      }

      bc->need_disconnect = 0;
      bc->need_release = 0;
      bc->need_release_complete = 0;

      stop_bc_tones(ch);
      hangup_chan(ch, bc);
      release_chan(ch, bc);
      break;
   case EVENT_BCHAN_ERROR:
   case EVENT_CLEANUP:
   {
      stop_bc_tones(ch);
      
      switch (ch->state) {
      case MISDN_CALLING:
         bc->cause = AST_CAUSE_DESTINATION_OUT_OF_ORDER;
         break;
      default:
         break;
      }
      
      hangup_chan(ch, bc);
      release_chan(ch, bc);
   }
   break;

   case EVENT_TONE_GENERATE:
   {
      int tone_len = bc->tone_cnt;
      struct ast_channel *ast = ch->ast;
      void *tmp;
      int res;
      int (*generate)(struct ast_channel *chan, void *tmp, int datalen, int samples);

      chan_misdn_log(9, bc->port, "TONE_GEN: len:%d\n", tone_len);

      if (!ast)
         break;

      if (!ast->generator)
         break;

      tmp = ast->generatordata;
      ast->generatordata = NULL;
      generate = ast->generator->generate;

      if (tone_len < 0 || tone_len > 512 ) {
         ast_log(LOG_NOTICE, "TONE_GEN: len was %d, set to 128\n", tone_len);
         tone_len = 128;
      }

      res = generate(ast, tmp, tone_len, tone_len);
      ast->generatordata = tmp;
      
      if (res) {
         ast_log(LOG_WARNING, "Auto-deactivating generator\n");
         ast_deactivate_generator(ast);
      } else {
         bc->tone_cnt = 0;
      }
   }
   break;

   case EVENT_BCHAN_DATA:
   {
      if (!misdn_cap_is_speech(ch->bc->capability)) {
         struct ast_frame frame;
         /*In Data Modes we queue frames*/
         memset(&frame, 0, sizeof(frame));
         frame.frametype  = AST_FRAME_VOICE; /*we have no data frames yet*/
         frame.subclass = AST_FORMAT_ALAW;
         frame.datalen = bc->bframe_len;
         frame.samples = bc->bframe_len;
         frame.mallocd = 0;
         frame.offset = 0;
         frame.delivery = ast_tv(0,0);
         frame.src = NULL;
         frame.data = bc->bframe;

         if (ch->ast) 
            ast_queue_frame(ch->ast, &frame);
      } else {
         struct pollfd pfd = { .fd = ch->pipe[1], .events = POLLOUT };
         int t;

         t = ast_poll(&pfd, 1, 0);

         if (t < 0) {
            chan_misdn_log(-1, bc->port, "poll() error (err=%s)\n", strerror(errno));
            break;
         }

         if (!t) {
            chan_misdn_log(9, bc->port, "poll() timed out\n");
            break;
         }

         if (pfd.revents & POLLOUT) {
            chan_misdn_log(9, bc->port, "writing %d bytes to asterisk\n", bc->bframe_len);
            if (write(ch->pipe[1], bc->bframe, bc->bframe_len) <= 0) {
               chan_misdn_log(0, bc->port, "Write returned <=0 (err=%s) --> hanging up channel\n", strerror(errno));

               stop_bc_tones(ch);
               hangup_chan(ch, bc);
               release_chan(ch, bc);
            }
         } else {
            chan_misdn_log(1, bc->port, "Write Pipe full!\n");
         }
      }
   }
   break;
   case EVENT_TIMEOUT:
   {
      if (ch && bc)
         chan_misdn_log(1, bc->port, "--> state: %s\n", misdn_get_ch_state(ch));

      switch (ch->state) {
      case MISDN_DIALING:
      case MISDN_PROGRESS:
         if (bc->nt && !ch->nttimeout)
            break;
         
      case MISDN_CALLING:
      case MISDN_ALERTING:
      case MISDN_PROCEEDING:
      case MISDN_CALLING_ACKNOWLEDGE:
         if (bc->nt) {
            bc->progress_indicator = INFO_PI_INBAND_AVAILABLE;
            hanguptone_indicate(ch);
         }
            
         bc->out_cause = AST_CAUSE_UNALLOCATED;
         misdn_lib_send_event(bc, EVENT_DISCONNECT);
         break;

      case MISDN_WAITING4DIGS:
         if (bc->nt) {
            bc->progress_indicator = INFO_PI_INBAND_AVAILABLE;
            bc->out_cause = AST_CAUSE_UNALLOCATED;
            hanguptone_indicate(ch);
            misdn_lib_send_event(bc, EVENT_DISCONNECT);
         } else {
            bc->out_cause = AST_CAUSE_NORMAL_CLEARING;
            misdn_lib_send_event(bc, EVENT_RELEASE);
         }
            
         break;

      case MISDN_CLEANING: 
         chan_misdn_log(1,bc->port," --> in state cleaning .. so ignoring, the stack should clean it for us\n");
         break;

      default:
         misdn_lib_send_event(bc,EVENT_RELEASE_COMPLETE);
      }
   }
   break;

    
   /****************************/
   /** Supplementary Services **/
   /****************************/
   case EVENT_RETRIEVE:
      if (!ch) {
         chan_misdn_log(4, bc->port, " --> no CH, searching for held call\n");
         ch = find_hold_call_l3(cl_te, bc->l3_id);
         if (!ch || ch->hold.state != MISDN_HOLD_ACTIVE) {
            ast_log(LOG_WARNING, "No held call found, cannot Retrieve\n");
            misdn_lib_send_event(bc, EVENT_RETRIEVE_REJECT);
            break;
         }
      }

      /* remember the channel again */
      ch->bc = bc;

      ch->hold.state = MISDN_HOLD_IDLE;
      ch->hold.port = 0;
      ch->hold.channel = 0;

      ast_queue_control(ch->ast, AST_CONTROL_UNHOLD);
   
      if (misdn_lib_send_event(bc, EVENT_RETRIEVE_ACKNOWLEDGE) < 0) {
         chan_misdn_log(4, bc->port, " --> RETRIEVE_ACK failed\n");
         misdn_lib_send_event(bc, EVENT_RETRIEVE_REJECT);
      }
      break;
    
   case EVENT_HOLD:
   {
      int hold_allowed;
      struct ast_channel *bridged;

      misdn_cfg_get(bc->port, MISDN_CFG_HOLD_ALLOWED, &hold_allowed, sizeof(int));

      if (!hold_allowed) {

         chan_misdn_log(-1, bc->port, "Hold not allowed this port.\n");
         misdn_lib_send_event(bc, EVENT_HOLD_REJECT);
         break;
      }

      bridged = ast_bridged_channel(ch->ast);
      if (bridged) {
         chan_misdn_log(2, bc->port, "Bridge Partner is of type: %s\n", bridged->tech->type);
         ch->l3id = bc->l3_id;

         /* forget the channel now */
         ch->bc = NULL;
         ch->hold.state = MISDN_HOLD_ACTIVE;
         ch->hold.port = bc->port;
         ch->hold.channel = bc->channel;

         ast_queue_control(ch->ast, AST_CONTROL_HOLD);
         
         misdn_lib_send_event(bc, EVENT_HOLD_ACKNOWLEDGE);
      } else {
         misdn_lib_send_event(bc, EVENT_HOLD_REJECT);
         chan_misdn_log(0, bc->port, "We aren't bridged to anybody\n");
      }
   } 
   break;
   
   case EVENT_FACILITY:
      if (!ch) {
         /* This may come from a call we don't know nothing about, so we ignore it. */
         chan_misdn_log(-1, bc->port, "Got EVENT_FACILITY but we don't have a ch!\n");
         break;
      }

      print_facility(&(bc->fac_in), bc);
      
      switch (bc->fac_in.Function) {
      case Fac_CD:
         {
            struct ast_channel *bridged = ast_bridged_channel(ch->ast);
            struct chan_list *ch_br;
            if (bridged && MISDN_ASTERISK_TECH_PVT(bridged)) {
               ch_br = MISDN_ASTERISK_TECH_PVT(bridged);
               /*ch->state = MISDN_FACILITY_DEFLECTED;*/
               if (ch_br->bc) {
                  if (ast_exists_extension(bridged, ch->context, (char *)bc->fac_in.u.CDeflection.DeflectedToNumber, 1, bc->oad)) {
                     ch_br->state = MISDN_DIALING;
                     if (pbx_start_chan(ch_br) < 0) {
                        chan_misdn_log(-1, ch_br->bc->port, "ast_pbx_start returned < 0 in misdn_overlap_dial_task\n");
                     }
                  }
               }
            }
            misdn_lib_send_event(bc, EVENT_DISCONNECT);
         } 
         break;
      case Fac_AOCDCurrency:
         {
            bc->AOCDtype = Fac_AOCDCurrency;
            memcpy(&(bc->AOCD.currency), &(bc->fac_in.u.AOCDcur), sizeof(struct FacAOCDCurrency));
            export_aoc_vars(ch->originator, ch->ast, bc);
         }
         break;
      case Fac_AOCDChargingUnit:
         {
            bc->AOCDtype = Fac_AOCDChargingUnit;
            memcpy(&(bc->AOCD.chargingUnit), &(bc->fac_in.u.AOCDchu), sizeof(struct FacAOCDChargingUnit));
            export_aoc_vars(ch->originator, ch->ast, bc);
         }
         break;
      default:
         chan_misdn_log(0, bc->port," --> not yet handled: facility type:%d\n", bc->fac_in.Function);
      }
      
      break;

   case EVENT_RESTART:

      if (!bc->dummy) {
         stop_bc_tones(ch);
         release_chan(ch, bc);
      }
      break;

   default:
      chan_misdn_log(1, 0, "Got Unknown Event\n");
      break;
   }
   
   return RESPONSE_OK;
}

/** TE STUFF END **/

/******************************************
 *
 *   Asterisk Channel Endpoint END
 *
 *
 *******************************************/



static int unload_module(void)
{
   /* First, take us out of the channel loop */
   ast_log(LOG_VERBOSE, "-- Unregistering mISDN Channel Driver --\n");

   misdn_tasks_destroy();
   
   if (!g_config_initialized)
      return 0;
   
   ast_cli_unregister_multiple(chan_misdn_clis, sizeof(chan_misdn_clis) / sizeof(struct ast_cli_entry));
   
   /* ast_unregister_application("misdn_crypt"); */
   ast_unregister_application("misdn_set_opt");
   ast_unregister_application("misdn_facility");
   ast_unregister_application("misdn_check_l2l1");
  
   ast_channel_unregister(&misdn_tech);

   free_robin_list();
   misdn_cfg_destroy();
   misdn_lib_destroy();
  
   free(misdn_out_calls);
   free(misdn_in_calls);
   free(misdn_debug_only);
   free(misdn_ports);
   free(misdn_debug);
   
   return 0;
}

static int load_module(void)
{
   int i, port;
   int ntflags = 0, ntkc = 0;
   char ports[256] = "";
   char tempbuf[BUFFERSIZE + 1];
   char ntfile[BUFFERSIZE + 1];
   struct misdn_lib_iface iface = {
      .cb_event = cb_events,
      .cb_log = chan_misdn_log,
      .cb_jb_empty = chan_misdn_jb_empty,
   };

   max_ports = misdn_lib_maxports_get();
   
   if (max_ports <= 0) {
      ast_log(LOG_ERROR, "Unable to initialize mISDN\n");
      return AST_MODULE_LOAD_DECLINE;
   }
   
   if (misdn_cfg_init(max_ports)) {
      ast_log(LOG_ERROR, "Unable to initialize misdn_config.\n");
      return AST_MODULE_LOAD_DECLINE;
   }
   g_config_initialized = 1;
   
   misdn_debug = (int *) malloc(sizeof(int) * (max_ports + 1));
   if (!misdn_debug) {
      ast_log(LOG_ERROR, "Out of memory for misdn_debug\n");
      return AST_MODULE_LOAD_DECLINE;
   }
   misdn_ports = (int *) malloc(sizeof(int) * (max_ports + 1));
   if (!misdn_ports) {
      free(misdn_debug);
      ast_log(LOG_ERROR, "Out of memory for misdn_ports\n");
      return AST_MODULE_LOAD_DECLINE;
   }
   misdn_cfg_get(0, MISDN_GEN_DEBUG, &misdn_debug[0], sizeof(int));
   for (i = 1; i <= max_ports; i++) {
      misdn_debug[i] = misdn_debug[0];
      misdn_ports[i] = i;
   }
   *misdn_ports = 0;
   misdn_debug_only = (int *) calloc(max_ports + 1, sizeof(int));
   if (!misdn_debug_only) {
      free(misdn_ports);
      free(misdn_debug);
      ast_log(LOG_ERROR, "Out of memory for misdn_debug_only\n");
      return AST_MODULE_LOAD_DECLINE;
   }

   misdn_cfg_get(0, MISDN_GEN_TRACEFILE, tempbuf, BUFFERSIZE);
   if (!ast_strlen_zero(tempbuf))
      tracing = 1;

   misdn_in_calls = (int *) malloc(sizeof(int) * (max_ports + 1));
   if (!misdn_in_calls) {
      free(misdn_debug_only);
      free(misdn_ports);
      free(misdn_debug);
      ast_log(LOG_ERROR, "Out of memory for misdn_in_calls\n");
      return AST_MODULE_LOAD_DECLINE;
   }
   misdn_out_calls = (int *) malloc(sizeof(int) * (max_ports + 1));
   if (!misdn_out_calls) {
      free(misdn_in_calls);
      free(misdn_debug_only);
      free(misdn_ports);
      free(misdn_debug);
      ast_log(LOG_ERROR, "Out of memory for misdn_out_calls\n");
      return AST_MODULE_LOAD_DECLINE;
   }

   for (i = 1; i <= max_ports; i++) {
      misdn_in_calls[i] = 0;
      misdn_out_calls[i] = 0;
   }

   ast_mutex_init(&cl_te_lock);
   ast_mutex_init(&release_lock);

   misdn_cfg_update_ptp();
   misdn_cfg_get_ports_string(ports);

   if (!ast_strlen_zero(ports))
      chan_misdn_log(0, 0, "Got: %s from get_ports\n", ports);
   if (misdn_lib_init(ports, &iface, NULL))
      chan_misdn_log(0, 0, "No te ports initialized\n");

   misdn_cfg_get(0, MISDN_GEN_NTDEBUGFLAGS, &ntflags, sizeof(int));
   misdn_cfg_get(0, MISDN_GEN_NTDEBUGFILE, &ntfile, BUFFERSIZE);
   misdn_lib_nt_debug_init(ntflags, ntfile);

   misdn_cfg_get( 0, MISDN_GEN_NTKEEPCALLS, &ntkc, sizeof(int));
   misdn_lib_nt_keepcalls(ntkc);

   if (ast_channel_register(&misdn_tech)) {
      ast_log(LOG_ERROR, "Unable to register channel class %s\n", misdn_type);
      unload_module();
      return -1;
   }
  
   ast_cli_register_multiple(chan_misdn_clis, sizeof(chan_misdn_clis) / sizeof(struct ast_cli_entry));

   ast_register_application("misdn_set_opt", misdn_set_opt_exec, "misdn_set_opt",
      "misdn_set_opt(:<opt><optarg>:<opt><optarg>...):\n"
      "Sets mISDN opts. and optargs\n"
      "\n"
      "The available options are:\n"
      "    a - Have Asterisk detect DTMF tones on called channel\n"
      "    c - Make crypted outgoing call, optarg is keyindex\n"
      "    d - Send display text to called phone, text is the optarg\n"
      "    e - Perform echo cancellation on this channel,\n"
      "        takes taps as optarg (32,64,128,256)\n"
      "   e! - Disable echo cancellation on this channel\n"
      "    f - Enable fax detection\n"
      "    h - Make digital outgoing call\n"
      "   h1 - Make HDLC mode digital outgoing call\n"
      "    i - Ignore detected DTMF tones, don't signal them to Asterisk,\n"
      "        they will be transported inband.\n"
      "   jb - Set jitter buffer length, optarg is length\n"
      "   jt - Set jitter buffer upper threshold, optarg is threshold\n"
      "   jn - Disable jitter buffer\n"
      "    n - Disable mISDN DSP on channel.\n"
      "        Disables: echo cancel, DTMF detection, and volume control.\n"
      "    p - Caller ID presentation,\n"
      "        optarg is either 'allowed' or 'restricted'\n"
      "    s - Send Non-inband DTMF as inband\n"
      "   vr - Rx gain control, optarg is gain\n"
      "   vt - Tx gain control, optarg is gain\n"
      );

   
   ast_register_application("misdn_facility", misdn_facility_exec, "misdn_facility",
             "misdn_facility(<FACILITY_TYPE>|<ARG1>|..)\n"
             "Sends the Facility Message FACILITY_TYPE with \n"
             "the given Arguments to the current ISDN Channel\n"
             "Supported Facilities are:\n"
             "\n"
             "type=calldeflect args=Nr where to deflect\n"
      );


   ast_register_application("misdn_check_l2l1", misdn_check_l2l1, "misdn_check_l2l1",
             "misdn_check_l2l1(<port>||g:<groupname>,timeout)"
             "Checks if the L2 and L1 are up on either the given <port> or\n"
             "on the ports in the group with <groupname>\n"
             "If the L1/L2 are down, check_l2l1 gets up the L1/L2 and waits\n"
             "for <timeout> seconds that this happens. Otherwise, nothing happens\n"
             "\n"
             "This application, ensures the L1/L2 state of the Ports in a group\n"
             "it is intended to make the pmp_l1_check option redundant and to\n"
             "fix a buggy switch config from your provider\n"
             "\n"
             "a sample dialplan would look like:\n\n"
             "exten => _X.,1,misdn_check_l2l1(g:out|2)\n"
             "exten => _X.,n,dial(mISDN/g:out/${EXTEN})\n"
             "\n"
      );


   misdn_cfg_get(0, MISDN_GEN_TRACEFILE, global_tracefile, BUFFERSIZE);

   /* start the l1 watchers */
   
   for (port = misdn_cfg_get_next_port(0); port >= 0; port = misdn_cfg_get_next_port(port)) {
      int l1timeout;
      misdn_cfg_get(port, MISDN_CFG_L1_TIMEOUT, &l1timeout, sizeof(l1timeout));
      if (l1timeout) {
         chan_misdn_log(4, 0, "Adding L1watcher task: port:%d timeout:%ds\n", port, l1timeout);
         misdn_tasks_add(l1timeout * 1000, misdn_l1_task, &misdn_ports[port]);  
      }
   }

   chan_misdn_log(0, 0, "-- mISDN Channel Driver Registered --\n");

   return 0;
}



static int reload(void)
{
   reload_config();

   return 0;
}

/*** SOME APPS ;)***/

static int misdn_facility_exec(struct ast_channel *chan, void *data)
{
   struct chan_list *ch = MISDN_ASTERISK_TECH_PVT(chan);
   char *tok, *tokb;

   chan_misdn_log(0, 0, "TYPE: %s\n", chan->tech->type);
   
   if (strcasecmp(chan->tech->type, "mISDN")) {
      ast_log(LOG_WARNING, "misdn_facility makes only sense with chan_misdn channels!\n");
      return -1;
   }
   
   if (ast_strlen_zero((char *)data)) {
      ast_log(LOG_WARNING, "misdn_facility Requires arguments\n");
      return -1;
   }

   tok = strtok_r((char*) data, "|", &tokb) ;

   if (!tok) {
      ast_log(LOG_WARNING, "misdn_facility Requires arguments\n");
      return -1;
   }

   if (!strcasecmp(tok, "calldeflect")) {
      tok = strtok_r(NULL, "|", &tokb) ;
      
      if (!tok) {
         ast_log(LOG_WARNING, "Facility: Call Defl Requires arguments\n");
      }

      if (strlen(tok) >= sizeof(ch->bc->fac_out.u.CDeflection.DeflectedToNumber)) {
         ast_log(LOG_WARNING, "Facility: Number argument too long (up to 15 digits are allowed). Ignoring.\n");
         return 0; 
      }
      ch->bc->fac_out.Function = Fac_CD;
      ast_copy_string((char *)ch->bc->fac_out.u.CDeflection.DeflectedToNumber, tok, sizeof(ch->bc->fac_out.u.CDeflection.DeflectedToNumber));
      misdn_lib_send_event(ch->bc, EVENT_FACILITY);
   } else {
      chan_misdn_log(1, ch->bc->port, "Unknown Facility: %s\n", tok);
   }

   return 0;
}

static int misdn_check_l2l1(struct ast_channel *chan, void *data)
{
   char group[BUFFERSIZE + 1];
   char *port_str;
   int port = 0;
   int timeout;
   int dowait = 0;
   int port_up;

   AST_DECLARE_APP_ARGS(args,
         AST_APP_ARG(grouppar);
         AST_APP_ARG(timeout);
   );

   if (ast_strlen_zero((char *)data)) {
      ast_log(LOG_WARNING, "misdn_check_l2l1 Requires arguments\n");
      return -1;
   }

   AST_STANDARD_APP_ARGS(args, data);

   if (args.argc != 2) {
      ast_log(LOG_WARNING, "Wrong argument count\n");
      return 0;
   }

   /*ast_log(LOG_NOTICE, "Arguments: group/port '%s' timeout '%s'\n", args.grouppar, args.timeout);*/
   timeout = atoi(args.timeout);
   port_str = args.grouppar;

   if (port_str[0] == 'g' && port_str[1] == ':' ) {
      /* We make a group call lets checkout which ports are in my group */
      port_str += 2;
      ast_copy_string(group, port_str, sizeof(group));
      chan_misdn_log(2, 0, "Checking Ports in group: %s\n", group);

      for ( port = misdn_cfg_get_next_port(port); 
         port > 0;
         port = misdn_cfg_get_next_port(port)) {
         char cfg_group[BUFFERSIZE + 1];

         chan_misdn_log(2, 0, "trying port %d\n", port);

         misdn_cfg_get(port, MISDN_CFG_GROUPNAME, cfg_group, BUFFERSIZE);

         if (!strcasecmp(cfg_group, group)) {
            port_up = misdn_lib_port_up(port, 1);

            if (!port_up) {
               chan_misdn_log(2, 0, " --> port '%d'\n", port);
               misdn_lib_get_port_up(port);
               dowait = 1;
            }
         }
      }

   } else {
      port = atoi(port_str);
      chan_misdn_log(2, 0, "Checking Port: %d\n",port);
      port_up = misdn_lib_port_up(port, 1);
      if (!port_up) {
         misdn_lib_get_port_up(port);
         dowait = 1;
      }
   }

   if (dowait) {
      chan_misdn_log(2, 0, "Waiting for '%d' seconds\n", timeout);
      sleep(timeout);
   }

   return 0;
}

static int misdn_set_opt_exec(struct ast_channel *chan, void *data)
{
   struct chan_list *ch = MISDN_ASTERISK_TECH_PVT(chan);
   char *tok, *tokb;
   int  keyidx = 0;
   int rxgain = 0;
   int txgain = 0;
   int change_jitter = 0;

   if (strcasecmp(chan->tech->type, "mISDN")) {
      ast_log(LOG_WARNING, "misdn_set_opt makes only sense with chan_misdn channels!\n");
      return -1;
   }
   
   if (ast_strlen_zero((char *)data)) {
      ast_log(LOG_WARNING, "misdn_set_opt Requires arguments\n");
      return -1;
   }

   for (tok = strtok_r((char*) data, ":", &tokb);
        tok;
        tok = strtok_r(NULL, ":", &tokb) ) {
      int neglect = 0;

      if (tok[0] == '!' ) {
         neglect = 1;
         tok++;
      }
      
      switch(tok[0]) {
         
      case 'd' :
         ast_copy_string(ch->bc->display, ++tok, sizeof(ch->bc->display));
         chan_misdn_log(1, ch->bc->port, "SETOPT: Display:%s\n", ch->bc->display);
         break;
         
      case 'n':
         chan_misdn_log(1, ch->bc->port, "SETOPT: No DSP\n");
         ch->bc->nodsp = 1;
         break;

      case 'j':
         chan_misdn_log(1, ch->bc->port, "SETOPT: jitter\n");
         tok++;
         change_jitter = 1;

         switch ( tok[0] ) {
         case 'b':
            ch->jb_len = atoi(++tok);
            chan_misdn_log(1, ch->bc->port, " --> buffer_len:%d\n", ch->jb_len);
            break;
         case 't' :
            ch->jb_upper_threshold = atoi(++tok);
            chan_misdn_log(1, ch->bc->port, " --> upper_threshold:%d\n", ch->jb_upper_threshold);
            break;
         case 'n':
            ch->bc->nojitter = 1;
            chan_misdn_log(1, ch->bc->port, " --> nojitter\n");
            break;
         default:
            ch->jb_len = 4000;
            ch->jb_upper_threshold = 0;
            chan_misdn_log(1, ch->bc->port, " --> buffer_len:%d (default)\n", ch->jb_len);
            chan_misdn_log(1, ch->bc->port, " --> upper_threshold:%d (default)\n", ch->jb_upper_threshold);
         }
         break;
      case 'v':
         tok++;

         switch (tok[0]) {
         case 'r' :
            rxgain = atoi(++tok);
            if (rxgain < -8)
               rxgain = -8;
            if (rxgain > 8)
               rxgain = 8;
            ch->bc->rxgain = rxgain;
            chan_misdn_log(1, ch->bc->port, "SETOPT: Volume:%d\n", rxgain);
            break;
         case 't':
            txgain = atoi(++tok);
            if (txgain < -8)
               txgain = -8;
            if (txgain > 8)
               txgain = 8;
            ch->bc->txgain = txgain;
            chan_misdn_log(1, ch->bc->port, "SETOPT: Volume:%d\n", txgain);
            break;
         }
         break;
      
      case 'c':
         keyidx = atoi(++tok);
         {
            char keys[4096];
            char *key = NULL, *tmp = keys;
            int i;
            misdn_cfg_get(0, MISDN_GEN_CRYPT_KEYS, keys, sizeof(keys));

            for (i = 0; i < keyidx; i++) {
               key = strsep(&tmp, ",");
            }

            if (key) {
               ast_copy_string(ch->bc->crypt_key, key, sizeof(ch->bc->crypt_key));
            }

            chan_misdn_log(0, ch->bc->port, "SETOPT: crypt with key:%s\n", ch->bc->crypt_key);
            break;
         }
      case 'e':
         chan_misdn_log(1, ch->bc->port, "SETOPT: EchoCancel\n");
         
         if (neglect) {
            chan_misdn_log(1, ch->bc->port, " --> disabled\n");
#ifdef MISDN_1_2
            *ch->bc->pipeline = 0;
#else
            ch->bc->ec_enable = 0;
#endif
         } else {
#ifdef MISDN_1_2
            update_pipeline_config(ch->bc);
#else
            ch->bc->ec_enable = 1;
            ch->bc->orig = ch->originator;
            tok++;
            if (*tok) {
               ch->bc->ec_deftaps = atoi(tok);
            }
#endif
         }
         
         break;
      case 'h':
         chan_misdn_log(1, ch->bc->port, "SETOPT: Digital\n");
         
         if (strlen(tok) > 1 && tok[1] == '1') {
            chan_misdn_log(1, ch->bc->port, "SETOPT: HDLC \n");
            if (!ch->bc->hdlc) {
               ch->bc->hdlc = 1;
            }
         }
         ch->bc->capability = INFO_CAPABILITY_DIGITAL_UNRESTRICTED;
         break;
            
      case 's':
         chan_misdn_log(1, ch->bc->port, "SETOPT: Send DTMF\n");
         ch->bc->send_dtmf = 1;
         break;
         
      case 'f':
         chan_misdn_log(1, ch->bc->port, "SETOPT: Faxdetect\n");
         ch->faxdetect = 1;
         misdn_cfg_get(ch->bc->port, MISDN_CFG_FAXDETECT_TIMEOUT, &ch->faxdetect_timeout, sizeof(ch->faxdetect_timeout));
         break;

      case 'a':
         chan_misdn_log(1, ch->bc->port, "SETOPT: AST_DSP (for DTMF)\n");
         ch->ast_dsp = 1;
         break;

      case 'p':
         chan_misdn_log(1, ch->bc->port, "SETOPT: callerpres: %s\n", &tok[1]);
         /* CRICH: callingpres!!! */
         if (strstr(tok,"allowed")) {
            ch->bc->pres = 0;
         } else if (strstr(tok, "restricted")) {
            ch->bc->pres = 1;
         } else if (strstr(tok, "not_screened")) {
            chan_misdn_log(0, ch->bc->port, "SETOPT: callerpres: not_screened is deprecated\n");
            ch->bc->pres = 1;
         }
         break;
      case 'i' :
         chan_misdn_log(1, ch->bc->port, "Ignoring dtmf tones, just use them inband\n");
         ch->ignore_dtmf=1;
         break;
      default:
         break;
      }
   }

   if (change_jitter)
      config_jitterbuffer(ch);

   if (ch->faxdetect || ch->ast_dsp) {
      if (!ch->dsp)
         ch->dsp = ast_dsp_new();
      if (ch->dsp)
         ast_dsp_set_features(ch->dsp, DSP_FEATURE_DTMF_DETECT| DSP_FEATURE_FAX_DETECT);
   }

   if (ch->ast_dsp) {
      chan_misdn_log(1, ch->bc->port, "SETOPT: with AST_DSP we deactivate mISDN_dsp\n");
      ch->bc->nodsp = 1;
   }
   
   return 0;
}


int chan_misdn_jb_empty ( struct misdn_bchannel *bc, char *buf, int len) 
{
   struct chan_list *ch = find_chan_by_bc(cl_te, bc);
   
   if (ch && ch->jb) {
      return misdn_jb_empty(ch->jb, buf, len);
   }
   
   return -1;
}



/*******************************************************/
/***************** JITTERBUFFER ************************/
/*******************************************************/


/* allocates the jb-structure and initialize the elements*/
struct misdn_jb *misdn_jb_init(int size, int upper_threshold)
{
   int i;
   struct misdn_jb *jb;

   jb = malloc(sizeof(struct misdn_jb));
   if (!jb) {
       chan_misdn_log(-1, 0, "No free Mem for jb\n");
       return NULL;
   }
   jb->size = size;
   jb->upper_threshold = upper_threshold;
   jb->wp = 0;
   jb->rp = 0;
   jb->state_full = 0;
   jb->state_empty = 0;
   jb->bytes_wrote = 0;
   jb->samples = malloc(size * sizeof(char));
   if (!jb->samples) {
      free(jb);
      chan_misdn_log(-1, 0, "No free Mem for jb->samples\n");
      return NULL;
   }

   jb->ok = malloc(size * sizeof(char));
   if (!jb->ok) {
      free(jb->samples);
      free(jb);
      chan_misdn_log(-1, 0, "No free Mem for jb->ok\n");
      return NULL;
   }

   for (i = 0; i < size; i++)
      jb->ok[i] = 0;

   ast_mutex_init(&jb->mutexjb);

   return jb;
}

/* frees the data and destroys the given jitterbuffer struct */
void misdn_jb_destroy(struct misdn_jb *jb)
{
   ast_mutex_destroy(&jb->mutexjb);
   
   free(jb->ok);
   free(jb->samples);
   free(jb);
}

/* fills the jitterbuffer with len data returns < 0 if there was an
   error (buffer overflow). */
int misdn_jb_fill(struct misdn_jb *jb, const char *data, int len)
{
   int i, j, rp, wp;

   if (!jb || ! data)
      return 0;

   ast_mutex_lock(&jb->mutexjb);
   
   wp = jb->wp;
   rp = jb->rp;
   
   for (i = 0; i < len; i++) {
      jb->samples[wp] = data[i];
      jb->ok[wp] = 1;
      wp = (wp != jb->size - 1) ? wp + 1 : 0;

      if (wp == jb->rp)
         jb->state_full = 1;
   }

   if (wp >= rp)
      jb->state_buffer = wp - rp;
   else
      jb->state_buffer = jb->size - rp + wp;
   chan_misdn_log(9, 0, "misdn_jb_fill: written:%d | Buffer status:%d p:%p\n", len, jb->state_buffer, jb);

   if (jb->state_full) {
      jb->wp = wp;

      rp = wp;
      for (j = 0; j < jb->upper_threshold; j++)
         rp = (rp != 0) ? rp - 1 : jb->size - 1;
      jb->rp = rp;
      jb->state_full = 0;
      jb->state_empty = 1;

      ast_mutex_unlock(&jb->mutexjb);

      return -1;
   }

   if (!jb->state_empty) {
      jb->bytes_wrote += len;
      if (jb->bytes_wrote >= jb->upper_threshold) {
         jb->state_empty = 1;
         jb->bytes_wrote = 0;
      }
   }
   jb->wp = wp;

   ast_mutex_unlock(&jb->mutexjb);
   
   return 0;
}

/* gets len bytes out of the jitterbuffer if available, else only the
available data is returned and the return value indicates the number
of data. */
int misdn_jb_empty(struct misdn_jb *jb, char *data, int len)
{
   int i, wp, rp, read = 0;

   ast_mutex_lock(&jb->mutexjb);

   rp = jb->rp;
   wp = jb->wp;

   if (jb->state_empty) {  
      for (i = 0; i < len; i++) {
         if (wp == rp) {
            jb->rp = rp;
            jb->state_empty = 0;

            ast_mutex_unlock(&jb->mutexjb);

            return read;
         } else {
            if (jb->ok[rp] == 1) {
               data[i] = jb->samples[rp];
               jb->ok[rp] = 0;
               rp = (rp != jb->size - 1) ? rp + 1 : 0;
               read += 1;
            }
         }
      }

      if (wp >= rp)
         jb->state_buffer = wp - rp;
      else
         jb->state_buffer = jb->size - rp + wp;
      chan_misdn_log(9, 0, "misdn_jb_empty: read:%d | Buffer status:%d p:%p\n", len, jb->state_buffer, jb);

      jb->rp = rp;
   } else
      chan_misdn_log(9, 0, "misdn_jb_empty: Wait...requested:%d p:%p\n", len, jb);

   ast_mutex_unlock(&jb->mutexjb);

   return read;
}




/*******************************************************/
/*************** JITTERBUFFER  END *********************/
/*******************************************************/




static void chan_misdn_log(int level, int port, char *tmpl, ...)
{
   va_list ap;
   char buf[1024];
   char port_buf[8];

   if (! ((0 <= port) && (port <= max_ports))) {
      ast_log(LOG_WARNING, "cb_log called with out-of-range port number! (%d)\n", port);
      port = 0;
      level = -1;
   }

   snprintf(port_buf, sizeof(port_buf), "P[%2d] ", port);

   va_start(ap, tmpl);
   vsnprintf(buf, sizeof(buf), tmpl, ap);
   va_end(ap);

   if (level == -1)
      ast_log(LOG_WARNING, "%s", buf);

   else if (misdn_debug_only[port] ? 
         (level == 1 && misdn_debug[port]) || (level == misdn_debug[port]) 
       : level <= misdn_debug[port]) {
      
      ast_console_puts(port_buf);
      ast_console_puts(buf);
   }
   
   if ((level <= misdn_debug[0]) && !ast_strlen_zero(global_tracefile) ) {
      time_t tm = time(NULL);
      char *tmp = ctime(&tm), *p;

      FILE *fp = fopen(global_tracefile, "a+");

      p = strchr(tmp, '\n');
      if (p)
         *p = ':';
      
      if (!fp) {
         ast_console_puts("Error opening Tracefile: [ ");
         ast_console_puts(global_tracefile);
         ast_console_puts(" ] ");
         
         ast_console_puts(strerror(errno));
         ast_console_puts("\n");
         return ;
      }
      
      fputs(tmp, fp);
      fputs(" ", fp);
      fputs(port_buf, fp);
      fputs(" ", fp);
      fputs(buf, fp);

      fclose(fp);
   }
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Channel driver for mISDN Support (BRI/PRI)",
   .load = load_module,
   .unload = unload_module,
   .reload = reload,
);