chan_h323.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005
 *
 * OpenH323 Channel Driver for ASTERISK PBX.
 *       By Jeremy McNamara
 *                      For The NuFone Network 
 *
 * chan_h323 has been derived from code created by
 *               Michael Manousos and Mark Spencer
 *
 * 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 This file is part of the chan_h323 driver for Asterisk
 *
 * \par See also
 * \arg Config_h323
 *
 * \ingroup channel_drivers
 */

#include <sys/socket.h>
#include <sys/signal.h>
#include <sys/param.h>
#if defined(BSD)
#ifndef IPTOS_MINCOST
#define IPTOS_MINCOST 0x02
#endif
#endif
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <unistd.h>
#include <stdlib.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#ifdef __cplusplus
extern "C" {
#endif   

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 211526 $")

#include "asterisk/lock.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/options.h"
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#include "asterisk/sched.h"
#include "asterisk/io.h"
#include "asterisk/rtp.h"
#include "asterisk/acl.h"
#include "asterisk/callerid.h"
#include "asterisk/cli.h"
#include "asterisk/dsp.h"
#include "asterisk/causes.h"
#ifdef __cplusplus
}
#endif
#include "h323/chan_h323.h"

send_digit_cb on_send_digit; 
on_rtp_cb on_external_rtp_create; 
start_rtp_cb on_start_rtp_channel; 
setup_incoming_cb on_incoming_call;
setup_outbound_cb on_outgoing_call; 
chan_ringing_cb   on_chan_ringing;
con_established_cb on_connection_established;
clear_con_cb on_connection_cleared;
answer_call_cb on_answer_call;
progress_cb on_progress;
rfc2833_cb on_set_rfc2833_payload;
hangup_cb on_hangup;
setcapabilities_cb on_setcapabilities;

/* global debug flag */
int h323debug;

/** Variables required by Asterisk */
static const char type[] = "H323";
static const char desc[] = "The NuFone Network's Open H.323 Channel Driver";
static const char tdesc[] = "The NuFone Network's Open H.323 Channel Driver";
static const char config[] = "h323.conf";
static char default_context[AST_MAX_CONTEXT] = "default";
static struct sockaddr_in bindaddr;

/** H.323 configuration values */
static int h323_signalling_port = 1720;
static char gatekeeper[100];
static int gatekeeper_disable = 1;
static int gatekeeper_discover = 0;
static int usingGk = 0;
static int gkroute = 0;
/* Find user by alias (h.323 id) is default, alternative is the incomming call's source IP address*/
static int userbyalias = 1;
static int tos = 0;
static char secret[50];
static unsigned int unique = 0;

static call_options_t global_options;

/** Private structure of a OpenH323 channel */
struct oh323_pvt {
   ast_mutex_t lock;             /* Channel private lock */
   call_options_t options;             /* Options to be used during call setup */
   int alreadygone;              /* Whether or not we've already been destroyed by our peer */
   int needdestroy;              /* if we need to be destroyed */
   call_details_t cd;               /* Call details */
   struct ast_channel *owner;          /* Who owns us */
   struct sockaddr_in sa;                       /* Our peer */
   struct sockaddr_in redirip;                 /* Where our RTP should be going if not to us */
   int nonCodecCapability;             /* non-audio capability */
   int outgoing;                 /* Outgoing or incoming call? */
   char exten[AST_MAX_EXTENSION];            /* Requested extension */
   char context[AST_MAX_CONTEXT];            /* Context where to start */
   char accountcode[256];              /* Account code */
   char cid_num[80];             /* Caller*id number, if available */
   char cid_name[80];               /* Caller*id name, if available */
   char rdnis[80];                  /* Referring DNIS, if available */
   int amaflags;                 /* AMA Flags */
   struct ast_rtp *rtp;             /* RTP Session */
   struct ast_dsp *vad;             /* Used for in-band DTMF detection */
   int nativeformats;               /* Codec formats supported by a channel */
   int needhangup;                  /* Send hangup when Asterisk is ready */
   int hangupcause;              /* Hangup cause from OpenH323 layer */
   int newstate;                 /* Pending state change */
   int newcontrol;                  /* Pending control to send */
   struct oh323_pvt *next;          /* Next channel in list */
} *iflist = NULL;

static struct ast_user_list {
   struct oh323_user *users;
   ast_mutex_t lock;
} userl;

static struct ast_peer_list {
   struct oh323_peer *peers;
   ast_mutex_t lock;
} peerl;

static struct ast_alias_list {
   struct oh323_alias *aliases;
   ast_mutex_t lock;
} aliasl;

/** Asterisk RTP stuff */
static struct sched_context *sched;
static struct io_context *io;

/** Protect the interface list (oh323_pvt) */
AST_MUTEX_DEFINE_STATIC(iflock);

/** Usage counter and associated lock */
static int usecnt = 0;
AST_MUTEX_DEFINE_STATIC(usecnt_lock);

/* Protect the monitoring thread, so only one process can kill or start it, and not
   when it's doing something critical. */
AST_MUTEX_DEFINE_STATIC(monlock);

/* Protect the H.323 capabilities list, to avoid more than one channel to set the capabilities simultaneaously in the h323 stack. */
AST_MUTEX_DEFINE_STATIC(caplock);

/* Protect the reload process */
AST_MUTEX_DEFINE_STATIC(h323_reload_lock);
static int h323_reloading = 0;

/* This is the thread for the monitor which checks for input on the channels
   which are not currently in use.  */
static pthread_t monitor_thread = AST_PTHREADT_NULL;
static int restart_monitor(void);
static int h323_do_reload(void);

static struct ast_channel *oh323_request(const char *type, int format, void *data, int *cause);
static int oh323_digit(struct ast_channel *c, char digit);
static int oh323_call(struct ast_channel *c, char *dest, int timeout);
static int oh323_hangup(struct ast_channel *c);
static int oh323_answer(struct ast_channel *c);
static struct ast_frame *oh323_read(struct ast_channel *c);
static int oh323_write(struct ast_channel *c, struct ast_frame *frame);
static int oh323_indicate(struct ast_channel *c, int condition);
static int oh323_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);

static const struct ast_channel_tech oh323_tech = {
   .type = type,
   .description = tdesc,
   .capabilities = AST_FORMAT_ULAW,
   .properties = AST_CHAN_TP_WANTSJITTER,
   .requester = oh323_request,
   .send_digit = oh323_digit,
   .call = oh323_call,
   .hangup = oh323_hangup,
   .answer = oh323_answer,
   .read = oh323_read,
   .write = oh323_write,
   .indicate = oh323_indicate,
   .fixup = oh323_fixup,
   /* disable, for now */
#if 0
   .bridge = ast_rtp_bridge,
#endif
};

/* Channel and private structures should be already locked */
static void __oh323_update_info(struct ast_channel *c, struct oh323_pvt *pvt)
{
   if (c->nativeformats != pvt->nativeformats) {
      if (h323debug)
         ast_log(LOG_DEBUG, "Preparing %s for new native format\n", c->name);
      c->nativeformats = pvt->nativeformats;
      ast_set_read_format(c, c->readformat);
      ast_set_write_format(c, c->writeformat);
   }
   if (pvt->needhangup) {
      if (h323debug)
         ast_log(LOG_DEBUG, "Process pending hangup for %s\n", c->name);
      c->_softhangup |= AST_SOFTHANGUP_DEV;
      c->hangupcause = pvt->hangupcause;
      ast_queue_hangup(c);
      pvt->needhangup = 0;
      pvt->newstate = pvt->newcontrol = -1;
   }
   if (pvt->newstate >= 0) {
      ast_setstate(c, pvt->newstate);
      pvt->newstate = -1;
   }
   if (pvt->newcontrol >= 0) {
      ast_queue_control(c, pvt->newcontrol);
      pvt->newcontrol = -1;
   }
}

/* Only channel structure should be locked */
static void oh323_update_info(struct ast_channel *c)
{
   struct oh323_pvt *pvt = c->tech_pvt;

   if (pvt) {
      ast_mutex_lock(&pvt->lock);
      __oh323_update_info(c, pvt);
      ast_mutex_unlock(&pvt->lock);
   }
}

static void cleanup_call_details(call_details_t *cd) 
{
        if (cd->call_token) {
                free(cd->call_token);
                cd->call_token = NULL;
        }
        if (cd->call_source_aliases) {
                free(cd->call_source_aliases);
                cd->call_source_aliases = NULL;
        }
        if (cd->call_dest_alias) {
                free(cd->call_dest_alias);
                cd->call_dest_alias = NULL;
   }
        if (cd->call_source_name) { 
                free(cd->call_source_name);
                cd->call_source_name = NULL;
        }
        if (cd->call_source_e164) {
                free(cd->call_source_e164);
                cd->call_source_e164 = NULL;
        }
        if (cd->call_dest_e164) {
                free(cd->call_dest_e164);
                cd->call_dest_e164 = NULL;
        }
        if (cd->sourceIp) {
                free(cd->sourceIp);
                cd->sourceIp = NULL;
        }
}

static void __oh323_destroy(struct oh323_pvt *pvt)
{
   struct oh323_pvt *cur, *prev = NULL;
   
   if (pvt->rtp) {
      ast_rtp_destroy(pvt->rtp);
   }
   
   /* Free dsp used for in-band DTMF detection */
   if (pvt->vad) {
      ast_dsp_free(pvt->vad);
   }
   cleanup_call_details(&pvt->cd);

   /* Unlink us from the owner if we have one */
   if (pvt->owner) {
      ast_mutex_lock(&pvt->owner->lock);
      ast_log(LOG_DEBUG, "Detaching from %s\n", pvt->owner->name);
      pvt->owner->tech_pvt = NULL;
      ast_mutex_unlock(&pvt->owner->lock);
   }
   cur = iflist;
   while(cur) {
      if (cur == pvt) {
         if (prev)
            prev->next = cur->next;
         else
            iflist = cur->next;
         break;
      }
      prev = cur;
      cur = cur->next;
   }
   if (!cur) {
      ast_log(LOG_WARNING, "%p is not in list?!?! \n", cur);
   } else {
      ast_mutex_destroy(&pvt->lock);
      free(pvt);
   }
}

static void oh323_destroy(struct oh323_pvt *pvt)
{
   ast_mutex_lock(&iflock);
   __oh323_destroy(pvt);
   ast_mutex_unlock(&iflock);
}

/**
 * Send (play) the specified digit to the channel.
 * 
 */
static int oh323_digit(struct ast_channel *c, char digit)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   char *token;

   if (!pvt) {
      ast_log(LOG_ERROR, "No private structure?! This is bad\n");
      return -1;
   }
   ast_mutex_lock(&pvt->lock);
   if (pvt->rtp && (pvt->options.dtmfmode & H323_DTMF_RFC2833)) {
      /* out-of-band DTMF */
      if (h323debug) {
         ast_log(LOG_DEBUG, "Sending out-of-band digit %c on %s\n", digit, c->name);
      }
      ast_rtp_senddigit(pvt->rtp, digit);
   } else {
      /* in-band DTMF */
      if (h323debug) {
         ast_log(LOG_DEBUG, "Sending inband digit %c on %s\n", digit, c->name);
      }
      token = pvt->cd.call_token ? strdup(pvt->cd.call_token) : NULL;
      h323_send_tone(token, digit);
      if (token) {
         free(token);
      }
   }
   ast_mutex_unlock(&pvt->lock);
   oh323_update_info(c);
   return 0;
}

/**
 * Make a call over the specified channel to the specified 
 * destination.
 * Returns -1 on error, 0 on success.
 */
static int oh323_call(struct ast_channel *c, char *dest, int timeout)
{  
   int res = 0;
   struct oh323_pvt *pvt = (struct oh323_pvt *)c->tech_pvt;
   char addr[INET_ADDRSTRLEN];
   char called_addr[1024];

   if (h323debug) {
      ast_log(LOG_DEBUG, "Calling to %s on %s\n", dest, c->name);
   }
   if ((c->_state != AST_STATE_DOWN) && (c->_state != AST_STATE_RESERVED)) {
      ast_log(LOG_WARNING, "Line is already in use (%s)\n", c->name);
      return -1;
   }
   ast_mutex_lock(&pvt->lock);
   if (usingGk) {
      if (ast_strlen_zero(pvt->exten)) {
         strncpy(called_addr, dest, sizeof(called_addr));
      } else {
         snprintf(called_addr, sizeof(called_addr), "%s@%s", pvt->exten, dest);
      }
   } else {
      ast_inet_ntoa(addr, sizeof(addr), pvt->sa.sin_addr);
      res = htons(pvt->sa.sin_port);
      if (ast_strlen_zero(pvt->exten)) {
         snprintf(called_addr, sizeof(called_addr), "%s:%d", addr, res);
      } else {
         snprintf(called_addr, sizeof(called_addr), "%s@%s:%d", pvt->exten, addr, res);
      }
   }
   /* make sure null terminated */
   called_addr[sizeof(called_addr) - 1] = '\0'; 

   if (c->cid.cid_num) {
      strncpy(pvt->options.cid_num, c->cid.cid_num, sizeof(pvt->options.cid_num));
   }
   if (c->cid.cid_name) {
      strncpy(pvt->options.cid_name, c->cid.cid_name, sizeof(pvt->options.cid_name));
   }

   /* indicate that this is an outgoing call */
   pvt->outgoing = 1;

   ast_log(LOG_DEBUG, "Placing outgoing call to %s, %d\n", called_addr, pvt->options.dtmfcodec);
   ast_mutex_unlock(&pvt->lock);
   res = h323_make_call(called_addr, &(pvt->cd), &pvt->options);
   if (res) {
      ast_log(LOG_NOTICE, "h323_make_call failed(%s)\n", c->name);
      return -1;
   }
   oh323_update_info(c);
   return 0;
}

static int oh323_answer(struct ast_channel *c)
{
   int res;
   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   char *token;

   if (h323debug)
      ast_log(LOG_DEBUG, "Answering on %s\n", c->name);

   ast_mutex_lock(&pvt->lock);
   token = pvt->cd.call_token ? strdup(pvt->cd.call_token) : NULL;
   ast_mutex_unlock(&pvt->lock);
   res = h323_answering_call(token, 0);
   if (token)
      free(token);

   oh323_update_info(c);
   if (c->_state != AST_STATE_UP) {
      ast_setstate(c, AST_STATE_UP);
   }
   return res;
}

static int oh323_hangup(struct ast_channel *c)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   int needcancel = 0;
   int q931cause = AST_CAUSE_NORMAL_CLEARING;
   char *call_token;


   if (h323debug)
      ast_log(LOG_DEBUG, "Hanging up call %s\n", c->name);

   if (!c->tech_pvt) {
      ast_log(LOG_DEBUG, "Asked to hangup channel not connected\n");
      return 0;
   }
   ast_mutex_lock(&pvt->lock);
   /* Determine how to disconnect */
   if (pvt->owner != c) {
      ast_log(LOG_WARNING, "Huh?  We aren't the owner?\n");
      ast_mutex_unlock(&pvt->lock);
      return 0;
   }
   if (!c || (c->_state != AST_STATE_UP)) {
      needcancel = 1;
   }
   
   pvt->owner = NULL;
   c->tech_pvt = NULL;

   if (c->hangupcause) {
      q931cause = c->hangupcause;
   } else {
      char *cause = pbx_builtin_getvar_helper(c, "DIALSTATUS");
      if (cause) {
         if (!strcmp(cause, "CONGESTION")) {
            q931cause = AST_CAUSE_NORMAL_CIRCUIT_CONGESTION;
         } else if (!strcmp(cause, "BUSY")) {
            q931cause = AST_CAUSE_USER_BUSY;
         } else if (!strcmp(cause, "CHANISUNVAIL")) {
            q931cause = AST_CAUSE_REQUESTED_CHAN_UNAVAIL;
         } else if (!strcmp(cause, "NOANSWER")) {
            q931cause = AST_CAUSE_NO_ANSWER;
         } else if (!strcmp(cause, "CANCEL")) {
            q931cause = AST_CAUSE_CALL_REJECTED;
         }
      }
   }

   /* Start the process if it's not already started */
   if (!pvt->alreadygone && !pvt->hangupcause) {
      call_token = pvt->cd.call_token ? strdup(pvt->cd.call_token) : NULL;
      if (call_token) {
         /* Release lock to eliminate deadlock */
         ast_mutex_unlock(&pvt->lock);
         if (h323_clear_call(call_token, q931cause)) { 
            ast_log(LOG_DEBUG, "ClearCall failed.\n");
         }
         free(call_token);
         ast_mutex_lock(&pvt->lock);
      }
   } 
   pvt->needdestroy = 1;

   /* Update usage counter */
   ast_mutex_lock(&usecnt_lock);
   usecnt--;
   if (usecnt < 0) {
      ast_log(LOG_WARNING, "Usecnt < 0\n");
   }
   ast_mutex_unlock(&usecnt_lock);
   ast_mutex_unlock(&pvt->lock);
   ast_update_use_count();
   return 0;
}

static struct ast_frame *oh323_rtp_read(struct oh323_pvt *pvt)
{
   /* Retrieve audio/etc from channel.  Assumes pvt->lock is already held. */
   struct ast_frame *f;
   static struct ast_frame null_frame = { AST_FRAME_NULL, };

   /* Only apply it for the first packet, we just need the correct ip/port */
   if (pvt->options.nat) {
      ast_rtp_setnat(pvt->rtp, pvt->options.nat);
      pvt->options.nat = 0;
   }

   f = ast_rtp_read(pvt->rtp);
   /* Don't send RFC2833 if we're not supposed to */
   if (f && (f->frametype == AST_FRAME_DTMF) && !(pvt->options.dtmfmode & H323_DTMF_RFC2833)) {
      return &null_frame;
   }
   if (pvt->owner) {
      /* We already hold the channel lock */
      if (f->frametype == AST_FRAME_VOICE) {
         if (f->subclass != pvt->owner->nativeformats) {
            /* Try to avoid deadlock */
            if (ast_mutex_trylock(&pvt->owner->lock)) {
               ast_log(LOG_NOTICE, "Format changed but channel is locked. Ignoring frame...\n");
               return &null_frame;
            }
            ast_log(LOG_DEBUG, "Oooh, format changed to %d\n", f->subclass);
            pvt->owner->nativeformats = f->subclass;
            pvt->nativeformats = f->subclass;
            ast_set_read_format(pvt->owner, pvt->owner->readformat);
            ast_set_write_format(pvt->owner, pvt->owner->writeformat);
            ast_mutex_unlock(&pvt->owner->lock);
         }  
         /* Do in-band DTMF detection */
         if ((pvt->options.dtmfmode & H323_DTMF_INBAND) && pvt->vad) {
            if (!ast_mutex_trylock(&pvt->owner->lock)) {
               f = ast_dsp_process(pvt->owner,pvt->vad,f);
               ast_mutex_unlock(&pvt->owner->lock);
            }
            else
               ast_log(LOG_NOTICE, "Unable to process inband DTMF while channel is locked\n");
            if (f &&(f->frametype == AST_FRAME_DTMF)) {
               ast_log(LOG_DEBUG, "Received in-band digit %c.\n", f->subclass);
            }
         }
      }
   }
   return f;
}

static struct ast_frame *oh323_read(struct ast_channel *c)
{
   struct ast_frame *fr;
   struct oh323_pvt *pvt = (struct oh323_pvt *)c->tech_pvt;
   ast_mutex_lock(&pvt->lock);
   __oh323_update_info(c, pvt);
   fr = oh323_rtp_read(pvt);
   ast_mutex_unlock(&pvt->lock);
   return fr;
}

static int oh323_write(struct ast_channel *c, struct ast_frame *frame)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   int res = 0;
   if (frame->frametype != AST_FRAME_VOICE) {
      if (frame->frametype == AST_FRAME_IMAGE) {
         return 0;
      } else {
         ast_log(LOG_WARNING, "Can't send %d type frames with H323 write\n", frame->frametype);
         return 0;
      }
   } else {
      if (!(frame->subclass & c->nativeformats)) {
         ast_log(LOG_WARNING, "Asked to transmit frame type %d, while native formats is %d (read/write = %d/%d)\n",
            frame->subclass, c->nativeformats, c->readformat, c->writeformat);
         return 0;
      }
   }
   if (pvt) {
      ast_mutex_lock(&pvt->lock);
      if (pvt->rtp) {
         res =  ast_rtp_write(pvt->rtp, frame);
      }
      __oh323_update_info(c, pvt);
      ast_mutex_unlock(&pvt->lock);
   }
   return res;
}

static int oh323_indicate(struct ast_channel *c, int condition)
{

   struct oh323_pvt *pvt = (struct oh323_pvt *) c->tech_pvt;
   char *token = (char *)NULL;

   ast_mutex_lock(&pvt->lock);
   token = (pvt->cd.call_token ? strdup(pvt->cd.call_token) : NULL);
   ast_mutex_unlock(&pvt->lock);

   if (h323debug)
      ast_log(LOG_DEBUG, "OH323: Indicating %d on %s\n", condition, token);

   switch(condition) {
   case AST_CONTROL_RINGING:
      if (c->_state == AST_STATE_RING || c->_state == AST_STATE_RINGING) {
         h323_send_alerting(token);
         break;
      }
      if (token)
         free(token);
      return -1;
   case AST_CONTROL_PROGRESS:
      if (c->_state != AST_STATE_UP) {
         h323_send_progress(token);
         break;
      }
      if (token)
         free(token);
      return -1;

   case AST_CONTROL_BUSY:
      if (c->_state != AST_STATE_UP) {
         h323_answering_call(token, 1);
         ast_mutex_lock(&pvt->lock);
         pvt->alreadygone = 1;
         ast_mutex_unlock(&pvt->lock);
         ast_softhangup_nolock(c, AST_SOFTHANGUP_DEV);         
         break;
      }
      if (token)
         free(token);
      return -1;
   case AST_CONTROL_CONGESTION:
      if (c->_state != AST_STATE_UP) {
         h323_answering_call(token, 1);
         ast_mutex_lock(&pvt->lock);
         pvt->alreadygone = 1;
         ast_mutex_unlock(&pvt->lock);
         ast_softhangup_nolock(c, AST_SOFTHANGUP_DEV);
         break;
      }
      if (token)
         free(token);
      return -1;
   case AST_CONTROL_PROCEEDING:
   case -1:
      if (token)
         free(token);
      return -1;
   default:
      ast_log(LOG_WARNING, "Don't know how to indicate condition %d on %s\n", condition, token);
      if (token)
         free(token);
      return -1;
   }

   if (h323debug)
      ast_log(LOG_DEBUG, "OH323: Indicated %d on %s\n", condition, token);
   if (token)
      free(token);
   oh323_update_info(c);

   return -1;
}

static int oh323_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
{
   struct oh323_pvt *pvt = (struct oh323_pvt *) newchan->tech_pvt;

   ast_mutex_lock(&pvt->lock);
   if (pvt->owner != oldchan) {
      ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n", oldchan, pvt->owner);
      return -1;
   }
   pvt->owner = newchan;
   ast_mutex_unlock(&pvt->lock);
   return 0;
}

/* Private structure should be locked on a call */
static struct ast_channel *__oh323_new(struct oh323_pvt *pvt, int state, const char *host)
{
   struct ast_channel *ch;
   int fmt;
   
   /* Don't hold a oh323_pvt lock while we allocate a chanel */
   ast_mutex_unlock(&pvt->lock);
   ch = ast_channel_alloc(1);
   /* Update usage counter */
   ast_mutex_lock(&usecnt_lock);
   usecnt++;
   ast_mutex_unlock(&usecnt_lock);
   ast_update_use_count();
   ast_mutex_lock(&pvt->lock);
   if (ch) {
      ch->tech = &oh323_tech;
      snprintf(ch->name, sizeof(ch->name), "H323/%s", host);
      ch->nativeformats = pvt->options.capability;
      if (!ch->nativeformats) {
         ch->nativeformats = global_options.capability;
      }
      pvt->nativeformats = ch->nativeformats;
      fmt = ast_best_codec(ch->nativeformats);
      ch->type = type;
      ch->fds[0] = ast_rtp_fd(pvt->rtp);
      if (state == AST_STATE_RING) {
         ch->rings = 1;
      }
      ch->writeformat = fmt;
      ch->rawwriteformat = fmt;
      ch->readformat = fmt;
      ch->rawreadformat = fmt;
      /* Allocate dsp for in-band DTMF support */
      if (pvt->options.dtmfmode & H323_DTMF_INBAND) {
         pvt->vad = ast_dsp_new();
         ast_dsp_set_features(pvt->vad, DSP_FEATURE_DTMF_DETECT);
         }
      /* Register channel functions. */
      ch->tech_pvt = pvt;
      /*  Set the owner of this channel */
      pvt->owner = ch;
      
      strncpy(ch->context, pvt->context, sizeof(ch->context) - 1);
      strncpy(ch->exten, pvt->exten, sizeof(ch->exten) - 1);      
      ch->priority = 1;
      if (!ast_strlen_zero(pvt->accountcode)) {
         strncpy(ch->accountcode, pvt->accountcode, sizeof(ch->accountcode) - 1);
      }
      if (pvt->amaflags) {
         ch->amaflags = pvt->amaflags;
      }

      if (!ast_strlen_zero(pvt->cid_num))
         ch->cid.cid_num = strdup(pvt->cid_num);
      else if (!ast_strlen_zero(pvt->cd.call_source_e164))
         ch->cid.cid_num = strdup(pvt->cd.call_source_e164);
      if (!ast_strlen_zero(pvt->cid_name))
         ch->cid.cid_name = strdup(pvt->cid_name);

      if (!ast_strlen_zero(pvt->rdnis)) {
         ch->cid.cid_rdnis = strdup(pvt->rdnis);
      }
      if (!ast_strlen_zero(pvt->exten) && strcmp(pvt->exten, "s")) {
         ch->cid.cid_dnid = strdup(pvt->exten);
      }
      ast_setstate(ch, state);
      if (state != AST_STATE_DOWN) {
         if (ast_pbx_start(ch)) {
            ast_log(LOG_WARNING, "Unable to start PBX on %s\n", ch->name);
            ast_hangup(ch);
            ch = NULL;
         }
      }
   } else  {
      ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
   }
   return ch;
}

static struct oh323_pvt *oh323_alloc(int callid)
{
   struct oh323_pvt *pvt;

   pvt = (struct oh323_pvt *) malloc(sizeof(struct oh323_pvt));
   if (!pvt) {
      ast_log(LOG_ERROR, "Couldn't allocate private structure. This is bad\n");
      return NULL;
   }
   memset(pvt, 0, sizeof(struct oh323_pvt));
   pvt->rtp = ast_rtp_new_with_bindaddr(sched, io, 1, 0,bindaddr.sin_addr);
   if (!pvt->rtp) {
      ast_log(LOG_WARNING, "Unable to create RTP session: %s\n", strerror(errno));
      free(pvt);
      return NULL;
   }
   ast_rtp_settos(pvt->rtp, tos);
   ast_mutex_init(&pvt->lock);
   /* Ensure the call token is allocated */
   if ((pvt->cd).call_token == NULL) {
      (pvt->cd).call_token = (char *)malloc(128);
   }
   if (!pvt->cd.call_token) {
      ast_log(LOG_ERROR, "Not enough memory to alocate call token\n");
      return NULL;
   }
   memset((char *)(pvt->cd).call_token, 0, 128);
   pvt->cd.call_reference = callid;
   memcpy(&pvt->options, &global_options, sizeof(pvt->options));
   if (pvt->options.dtmfmode & H323_DTMF_RFC2833) {
      pvt->nonCodecCapability |= AST_RTP_DTMF;
   } else {
      pvt->nonCodecCapability &= ~AST_RTP_DTMF;
   }
   strncpy(pvt->context, default_context, sizeof(pvt->context) - 1);
   pvt->newstate = pvt->newcontrol = -1;
   /* Add to interface list */
   ast_mutex_lock(&iflock);
   pvt->next = iflist;
   iflist = pvt;
   ast_mutex_unlock(&iflock);
   return pvt;
}

static struct oh323_pvt *find_call_locked(int call_reference, const char *token)
{  
   struct oh323_pvt *pvt;

   ast_mutex_lock(&iflock);
   pvt = iflist; 
   while(pvt) {
      if (!pvt->needdestroy && ((signed int)pvt->cd.call_reference == call_reference)) {
         /* Found the call */             
         if ((token != NULL) && (!strcmp(pvt->cd.call_token, token))) {
            ast_mutex_lock(&pvt->lock);
            ast_mutex_unlock(&iflock);
            return pvt;
         } else if (token == NULL) {
            ast_log(LOG_WARNING, "Call Token is NULL\n");
            ast_mutex_lock(&pvt->lock);
            ast_mutex_unlock(&iflock);
            return pvt;
         }
      }
      pvt = pvt->next; 
   }
   ast_mutex_unlock(&iflock);
   return NULL;
}

static int update_state(struct oh323_pvt *pvt, int state, int signal)
{
   if (!pvt)
      return 0;
   if (pvt->owner && !ast_mutex_trylock(&pvt->owner->lock)) {
      if (state >= 0)
         ast_setstate(pvt->owner, state);
      if (signal >= 0)
         ast_queue_control(pvt->owner, signal);
      return 1;
   }
   else {
      if (state >= 0)
         pvt->newstate = state;
      if (signal >= 0)
         pvt->newcontrol = signal;
      return 0;
   }
}

struct oh323_user *find_user(const call_details_t *cd)
{
   struct oh323_user *u;
   char iabuf[INET_ADDRSTRLEN];
   u = userl.users;
   if (userbyalias) {
      while(u) {
         if (!strcasecmp(u->name, cd->call_source_aliases)) {
            break;
         }
         u = u->next;
      }
   } else {
      while(u) {
         if (!strcasecmp(cd->sourceIp, ast_inet_ntoa(iabuf, sizeof(iabuf), u->addr.sin_addr))) {
            break;
         }
         u = u->next;
      }
   }
   return u;
}

struct oh323_peer *find_peer(const char *peer, struct sockaddr_in *sin)
{
   struct oh323_peer *p = NULL;
         static char iabuf[INET_ADDRSTRLEN];

   p = peerl.peers;
   if (peer) {
      while(p) {
         if (!strcasecmp(p->name, peer)) {
            ast_log(LOG_DEBUG, "Found peer %s by name\n", peer);
            break;
         }
         p = p->next;
      }
   } else {
      /* find by sin */
      if (sin) {
         while (p) {
            if ((!inaddrcmp(&p->addr, sin)) || 
               (p->addr.sin_addr.s_addr == sin->sin_addr.s_addr)) {
               ast_log(LOG_DEBUG, "Found peer %s/%s by addr\n", peer, ast_inet_ntoa(iabuf, sizeof(iabuf), p->addr.sin_addr));
               break;
            }
            p = p->next;
         }
      }  
   }
   if (!p) {
      ast_log(LOG_DEBUG, "Could not find peer %s by name or address\n", peer);
   }
   return p;
}

static int create_addr(struct oh323_pvt *pvt, char *opeer)
{
   struct hostent *hp;
   struct ast_hostent ahp;
   struct oh323_peer *p;
   int portno;
   int found = 0;
   char *port;
   char *hostn;
   char peer[256] = "";

   strncpy(peer, opeer, sizeof(peer) - 1);
   port = strchr(peer, ':');
   if (port) {
      *port = '\0';
      port++;
   }
   pvt->sa.sin_family = AF_INET;
   ast_mutex_lock(&peerl.lock);
   p = find_peer(peer, NULL);
   if (p) {
      found++;
      memcpy(&pvt->options, &p->options, sizeof(pvt->options));
      if (pvt->rtp) {
         ast_log(LOG_DEBUG, "Setting NAT on RTP to %d\n", pvt->options.nat);
         ast_rtp_setnat(pvt->rtp, pvt->options.nat);
      }
      if (pvt->options.dtmfmode) {
         if (pvt->options.dtmfmode & H323_DTMF_RFC2833) {
            pvt->nonCodecCapability |= AST_RTP_DTMF;
         } else {
            pvt->nonCodecCapability &= ~AST_RTP_DTMF;
         }
      }
      if (p->addr.sin_addr.s_addr) {
         pvt->sa.sin_addr = p->addr.sin_addr;   
         pvt->sa.sin_port = p->addr.sin_port;   
      } 
   }
   ast_mutex_unlock(&peerl.lock);
   if (!p && !found) {
      hostn = peer;
      if (port) {
         portno = atoi(port);
      } else {
         portno = h323_signalling_port;
      }     
      hp = ast_gethostbyname(hostn, &ahp);
      if (hp) {
         memcpy(&pvt->options, &global_options, sizeof(pvt->options));
         memcpy(&pvt->sa.sin_addr, hp->h_addr, sizeof(pvt->sa.sin_addr));
         pvt->sa.sin_port = htons(portno);
         return 0;   
      } else {
         ast_log(LOG_WARNING, "No such host: %s\n", peer);
         return -1;
      }
   } else if (!p) {
      return -1;
   } else { 
      return 0;
   }
}
static struct ast_channel *oh323_request(const char *type, int format, void *data, int *cause)
{
   int oldformat;
   struct oh323_pvt *pvt;
   struct ast_channel *tmpc = NULL;
   char *dest = (char *)data;
   char *ext, *host;
   char *h323id = NULL;
   char tmp[256], tmp1[256];
   
   ast_log(LOG_DEBUG, "type=%s, format=%d, data=%s.\n", type, format, (char *)data);
   pvt = oh323_alloc(0);
   if (!pvt) {
      ast_log(LOG_WARNING, "Unable to build pvt data for '%s'\n", (char *)data);
      return NULL;
   }  
   oldformat = format;
   format &= ((AST_FORMAT_MAX_AUDIO << 1) - 1);
   if (!format) {
      ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", format);
      return NULL;
   }
   strncpy(tmp, dest, sizeof(tmp) - 1);   
   host = strchr(tmp, '@');
   if (host) {
      *host = '\0';
      host++;
      ext = tmp;
   } else {
      host = tmp;
      ext = NULL;
   }
   strtok_r(host, "/", &(h323id));     
   if (!ast_strlen_zero(h323id)) {
      h323_set_id(h323id);
   }
   if (ext) {
      strncpy(pvt->exten, ext, sizeof(pvt->exten) - 1);
   }
   ast_log(LOG_DEBUG, "Extension: %s Host: %s\n",  pvt->exten, host);
   if (!usingGk) {
      if (create_addr(pvt, host)) {
         oh323_destroy(pvt);
         return NULL;
      }
   }
   else {
      memcpy(&pvt->options, &global_options, sizeof(pvt->options));
      if (pvt->rtp) {
         ast_log(LOG_DEBUG, "Setting NAT on RTP to %d\n", pvt->options.nat);
         ast_rtp_setnat(pvt->rtp, pvt->options.nat);
      }
      if (pvt->options.dtmfmode) {
         if (pvt->options.dtmfmode & H323_DTMF_RFC2833) {
            pvt->nonCodecCapability |= AST_RTP_DTMF;
         } else {
            pvt->nonCodecCapability &= ~AST_RTP_DTMF;
         }
      }
   }

   ast_mutex_lock(&caplock);
   /* Generate unique channel identifier */
   snprintf(tmp1, sizeof(tmp1)-1, "%s-%u", host, ++unique);
   tmp1[sizeof(tmp1)-1] = '\0';
   ast_mutex_unlock(&caplock);

   ast_mutex_lock(&pvt->lock);
   tmpc = __oh323_new(pvt, AST_STATE_DOWN, tmp1);
   ast_mutex_unlock(&pvt->lock);
   if (!tmpc) {
      oh323_destroy(pvt);
   }
   ast_update_use_count();
   restart_monitor();
   return tmpc;
}

/** Find a call by alias */
struct oh323_alias *find_alias(const char *source_aliases)
{
   struct oh323_alias *a;

   a = aliasl.aliases;
   while(a) {
      if (!strcasecmp(a->name, source_aliases)) {
         break;
      }
      a = a->next;
   }
   return a;
}

/**
  * Callback for sending digits from H.323 up to asterisk
  *
  */
int send_digit(unsigned call_reference, char digit, const char *token)
{
   struct oh323_pvt *pvt;
   struct ast_frame f;
   int res;

   ast_log(LOG_DEBUG, "Received Digit: %c\n", digit);
   pvt = find_call_locked(call_reference, token); 
   if (!pvt) {
      ast_log(LOG_ERROR, "Private structure not found in send_digit.\n");
      return -1;
   }
   memset(&f, 0, sizeof(f));
   f.frametype = AST_FRAME_DTMF;
   f.subclass = digit;
   f.datalen = 0;
   f.samples = 800;
   f.offset = 0;
   f.data = NULL;
   f.mallocd = 0;
   f.src = "SEND_DIGIT";   
   res = ast_queue_frame(pvt->owner, &f);
   ast_mutex_unlock(&pvt->lock);
   return res;
}

/**
  * Callback function used to inform the H.323 stack of the local rtp ip/port details
  *
  * Returns the local RTP information
  */
struct rtp_info *external_rtp_create(unsigned call_reference, const char * token)
{  
   struct oh323_pvt *pvt;
   struct sockaddr_in us;
   struct rtp_info *info;

   info = (struct rtp_info *)malloc(sizeof(struct rtp_info));
   if (!info) {
      ast_log(LOG_ERROR, "Unable to allocated info structure, this is very bad\n");
      return NULL;
   }
   pvt = find_call_locked(call_reference, token); 
   if (!pvt) {
      free(info);
      ast_log(LOG_ERROR, "Unable to find call %s(%d)\n", token, call_reference);
      return NULL;
   }
   /* figure out our local RTP port and tell the H.323 stack about it */
   ast_rtp_get_us(pvt->rtp, &us);
   ast_mutex_unlock(&pvt->lock);

   ast_inet_ntoa(info->addr, sizeof(info->addr), us.sin_addr);
   info->port = ntohs(us.sin_port);
   if (h323debug)
      ast_log(LOG_DEBUG, "Sending RTP 'US' %s:%d\n", info->addr, info->port);
   return info;
}

/**
 * Definition taken from rtp.c for rtpPayloadType because we need it here.
 */
struct rtpPayloadType {
   int isAstFormat;        /* whether the following code is an AST_FORMAT */
   int code;
};

/**
  * Call-back function passing remote ip/port information from H.323 to asterisk 
  *
  * Returns nothing 
  */
void setup_rtp_connection(unsigned call_reference, const char *remoteIp, int remotePort, const char *token, int pt)
{
   struct oh323_pvt *pvt;
   struct sockaddr_in them;
   struct rtpPayloadType rtptype;

   if (h323debug)
      ast_log(LOG_DEBUG, "Setting up RTP connection for %s\n", token);

   /* Find the call or allocate a private structure if call not found */
   pvt = find_call_locked(call_reference, token); 
   if (!pvt) {
      ast_log(LOG_ERROR, "Something is wrong: rtp\n");
      return;
   }
   if (pvt->alreadygone) {
      ast_mutex_unlock(&pvt->lock);
      return;
   }
   rtptype = ast_rtp_lookup_pt(pvt->rtp, pt);
   pvt->nativeformats = rtptype.code;
   if (pvt->owner && !ast_mutex_trylock(&pvt->owner->lock)) {
      pvt->owner->nativeformats = pvt->nativeformats;
      ast_set_read_format(pvt->owner, pvt->owner->readformat);
      ast_set_write_format(pvt->owner, pvt->owner->writeformat);
      if (pvt->options.progress_audio)
         ast_queue_control(pvt->owner, AST_CONTROL_PROGRESS);
      ast_mutex_unlock(&pvt->owner->lock);
   }
   else {
      if (pvt->options.progress_audio)
         pvt->newcontrol = AST_CONTROL_PROGRESS;
      if (h323debug)
         ast_log(LOG_DEBUG, "RTP connection preparation for %s is pending...\n", token);
   }

   them.sin_family = AF_INET;
   /* only works for IPv4 */
   them.sin_addr.s_addr = inet_addr(remoteIp); 
   them.sin_port = htons(remotePort);
   ast_rtp_set_peer(pvt->rtp, &them);

   ast_mutex_unlock(&pvt->lock);

   if (h323debug)
      ast_log(LOG_DEBUG, "RTP connection prepared for %s\n", token);

   return;
}

/**  
  *   Call-back function to signal asterisk that the channel has been answered 
  * Returns nothing
  */
void connection_made(unsigned call_reference, const char *token)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_log(LOG_DEBUG, "Call %s answered\n", token);

   pvt = find_call_locked(call_reference, token); 
   if (!pvt) {
      ast_log(LOG_ERROR, "Something is wrong: connection\n");
      return;
   }

   /* Inform asterisk about remote party connected only on outgoing calls */
   if (!pvt->outgoing) {
      ast_mutex_unlock(&pvt->lock);
      return;
   }
   if (update_state(pvt, AST_STATE_UP, AST_CONTROL_ANSWER))
      ast_mutex_unlock(&pvt->owner->lock);
   ast_mutex_unlock(&pvt->lock);
   return;
}

int progress(unsigned call_reference, const char *token, int inband)
{
   struct oh323_pvt *pvt;

   ast_log(LOG_DEBUG, "Received ALERT/PROGRESS message for %s tones\n", (inband ? "inband" : "self-generated"));

   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      ast_log(LOG_ERROR, "Private structure not found in progress.\n");
      return -1;
   }
   if (!pvt->owner) {
      ast_mutex_unlock(&pvt->lock);
      ast_log(LOG_ERROR, "No Asterisk channel associated with private structure.\n");
      return -1;
   }
   if (update_state(pvt, -1, (inband ? AST_CONTROL_PROGRESS : AST_CONTROL_RINGING)))
      ast_mutex_unlock(&pvt->owner->lock);
   ast_mutex_unlock(&pvt->lock);

   return 0;
}

/**
 *  Call-back function for incoming calls
 *
 *  Returns 1 on success
 */
call_options_t *setup_incoming_call(call_details_t *cd)
{
   struct oh323_pvt *pvt;
   struct oh323_user *user = NULL;
   struct oh323_alias *alias = NULL;
   char iabuf[INET_ADDRSTRLEN];

   if (h323debug)
      ast_log(LOG_DEBUG, "Setting up incoming call for %s\n", cd->call_token);

   /* allocate the call*/
   pvt = oh323_alloc(cd->call_reference);

   if (!pvt) {
      ast_log(LOG_ERROR, "Unable to allocate private structure, this is bad.\n");
      return NULL;
   }

   /* Populate the call details in the private structure */
   memcpy(&pvt->cd, cd, sizeof(pvt->cd));
   memcpy(&pvt->options, &global_options, sizeof(pvt->options));

   if (h323debug) {
      ast_verbose(VERBOSE_PREFIX_3 "Setting up Call\n");
      ast_verbose(VERBOSE_PREFIX_3 "\tCall token:  [%s]\n", pvt->cd.call_token);
      ast_verbose(VERBOSE_PREFIX_3 "\tCalling party name:  [%s]\n", pvt->cd.call_source_name);
      ast_verbose(VERBOSE_PREFIX_3 "\tCalling party number:  [%s]\n", pvt->cd.call_source_e164);
      ast_verbose(VERBOSE_PREFIX_3 "\tCalled party name:  [%s]\n", pvt->cd.call_dest_alias);
      ast_verbose(VERBOSE_PREFIX_3 "\tCalled party number:  [%s]\n", pvt->cd.call_dest_e164);
   }

   /* Decide if we are allowing Gatekeeper routed calls*/
   if ((!strcasecmp(cd->sourceIp, gatekeeper)) && (gkroute == -1) && (usingGk)) {
      if (!ast_strlen_zero(cd->call_dest_e164)) {
         strncpy(pvt->exten, cd->call_dest_e164, sizeof(pvt->exten) - 1);
         strncpy(pvt->context, default_context, sizeof(pvt->context) - 1); 
      } else {
         alias = find_alias(cd->call_dest_alias);
         if (!alias) {
            ast_log(LOG_ERROR, "Call for %s rejected, alias not found\n", cd->call_dest_alias);
            return NULL;
         }
         strncpy(pvt->exten, alias->name, sizeof(pvt->exten) - 1);
         strncpy(pvt->context, alias->context, sizeof(pvt->context) - 1);
      }
   } else {
      /* Either this call is not from the Gatekeeper 
         or we are not allowing gk routed calls */
      user  = find_user(cd);
      if (!user) {
         if (!ast_strlen_zero(pvt->cd.call_dest_e164)) {
            strncpy(pvt->exten, cd->call_dest_e164, sizeof(pvt->exten) - 1);
         } else {
            strncpy(pvt->exten, cd->call_dest_alias, sizeof(pvt->exten) - 1);
         }
         if (ast_strlen_zero(default_context)) {
            ast_log(LOG_ERROR, "Call from '%s' rejected due to no default context\n", pvt->cd.call_source_aliases);
            return NULL;
         }
         strncpy(pvt->context, default_context, sizeof(pvt->context) - 1);
         ast_log(LOG_DEBUG, "Sending %s to context [%s]\n", cd->call_source_aliases, pvt->context);
         /* XXX: Is it really required??? */
#if 0
         memset(&pvt->options, 0, sizeof(pvt->options));
#endif
      } else {
         if (user->host) {
            if (strcasecmp(cd->sourceIp, ast_inet_ntoa(iabuf, sizeof(iabuf), user->addr.sin_addr))) {
               if (ast_strlen_zero(user->context)) {
                  if (ast_strlen_zero(default_context)) {
                     ast_log(LOG_ERROR, "Call from '%s' rejected due to non-matching IP address (%s) and no default context\n", user->name, cd->sourceIp);
                              return NULL;
                  }
                  strncpy(pvt->context, default_context, sizeof(pvt->context) - 1);
               } else {
                  strncpy(pvt->context, user->context, sizeof(pvt->context) - 1);
               }
               pvt->exten[0] = 'i';
               pvt->exten[1] = '\0';
               ast_log(LOG_ERROR, "Call from '%s' rejected due to non-matching IP address (%s)s\n", user->name, cd->sourceIp);
               return NULL;   /* XXX: Hmmm... Why to setup context if we drop connection immediately??? */
            }
         }
         strncpy(pvt->context, user->context, sizeof(pvt->context) - 1);
         memcpy(&pvt->options, &user->options, sizeof(pvt->options));
         if (!ast_strlen_zero(pvt->cd.call_dest_e164)) {
            strncpy(pvt->exten, cd->call_dest_e164, sizeof(pvt->exten) - 1);
         } else {
            strncpy(pvt->exten, cd->call_dest_alias, sizeof(pvt->exten) - 1);
         }
         if (!ast_strlen_zero(user->accountcode)) {
            strncpy(pvt->accountcode, user->accountcode, sizeof(pvt->accountcode) - 1);
         } 
         if (user->amaflags) {
            pvt->amaflags = user->amaflags;
         } 
      } 
   }
   return &pvt->options;
}

/**
 * Call-back function to start PBX when OpenH323 ready to serve incoming call
 *
 * Returns 1 on success
 */
static int answer_call(unsigned call_reference, const char *token)
{
   struct oh323_pvt *pvt;
   struct ast_channel *c = NULL;

   if (h323debug)
      ast_log(LOG_DEBUG, "Preparing Asterisk to answer for %s\n", token);

   /* Find the call or allocate a private structure if call not found */
   pvt = find_call_locked(call_reference, token); 
   if (!pvt) {
      ast_log(LOG_ERROR, "Something is wrong: answer_call\n");
      return 0;
   }
   /* allocate a channel and tell asterisk about it */
   c = __oh323_new(pvt, AST_STATE_RINGING, pvt->cd.call_token);

   /* And release when done */
   ast_mutex_unlock(&pvt->lock);
   if (!c) {
      ast_log(LOG_ERROR, "Couldn't create channel. This is bad\n");
      return 0;
   }
   return 1;
}

/**
 * Call-back function to establish an outgoing H.323 call
 * 
 * Returns 1 on success 
 */
int setup_outgoing_call(call_details_t *cd)
{
   /* Use argument here or free it immediately */
   cleanup_call_details(cd);

   return 1;
}

/**
  *  Call-back function to signal asterisk that the channel is ringing
  *  Returns nothing
  */
void chan_ringing(unsigned call_reference, const char *token)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_log(LOG_DEBUG, "Ringing on %s\n", token);

   pvt = find_call_locked(call_reference, token); 
   if (!pvt) {
      ast_log(LOG_ERROR, "Something is wrong: ringing\n");
      return;
   }
   if (!pvt->owner) {
      ast_mutex_unlock(&pvt->lock);
      ast_log(LOG_ERROR, "Channel has no owner\n");
      return;
   }
   if (update_state(pvt, AST_STATE_RINGING, AST_CONTROL_RINGING))
      ast_mutex_unlock(&pvt->owner->lock);
   ast_mutex_unlock(&pvt->lock);
   return;
}

/**
  * Call-back function to cleanup communication
  * Returns nothing,
  */
static void cleanup_connection(unsigned call_reference, const char *call_token)
{  
   struct oh323_pvt *pvt;

   ast_log(LOG_DEBUG, "Cleaning connection to %s\n", call_token);
   
   while (1) {
      pvt = find_call_locked(call_reference, call_token); 
      if (!pvt) {
         if (h323debug)
            ast_log(LOG_DEBUG, "No connection for %s\n", call_token);
         return;
      }
      if (!pvt->owner || !ast_mutex_trylock(&pvt->owner->lock))
         break;
#if 1
#ifdef DEBUG_THREADS
      ast_log(LOG_NOTICE, "Avoiding H.323 destory deadlock on %s, locked at %ld/%d by %s (%s:%d)\n", call_token, pvt->owner->lock.thread, pvt->owner->lock.reentrancy, pvt->owner->lock.func, pvt->owner->lock.file, pvt->owner->lock.lineno);
#else
      ast_log(LOG_NOTICE, "Avoiding H.323 destory deadlock on %s\n", call_token);
#endif
#endif
      ast_mutex_unlock(&pvt->lock);
      usleep(1);
   }
   if (pvt->rtp) {
      /* Immediately stop RTP */
      ast_rtp_destroy(pvt->rtp);
      pvt->rtp = NULL;
   }
   /* Free dsp used for in-band DTMF detection */
   if (pvt->vad) {
      ast_dsp_free(pvt->vad);
      pvt->vad = NULL;
   }
   cleanup_call_details(&pvt->cd);
   pvt->alreadygone = 1;
   /* Send hangup */ 
   if (pvt->owner) {
      pvt->owner->_softhangup |= AST_SOFTHANGUP_DEV;
      ast_queue_hangup(pvt->owner);
      ast_mutex_unlock(&pvt->owner->lock);
   }
   ast_mutex_unlock(&pvt->lock);
   if (h323debug)
      ast_log(LOG_DEBUG, "Connection to %s cleaned\n", call_token);
   return;  
}

static void hangup_connection(unsigned int call_reference, const char *token, int cause)
{
   struct oh323_pvt *pvt;

   ast_log(LOG_DEBUG, "Hanging up connection to %s with cause %d\n", token, cause);
   
   pvt = find_call_locked(call_reference, token); 
   if (!pvt) {
      return;
   }
   if (pvt->owner && !ast_mutex_trylock(&pvt->owner->lock)) {
      pvt->owner->_softhangup |= AST_SOFTHANGUP_DEV;
      pvt->owner->hangupcause = pvt->hangupcause = cause;
      ast_queue_hangup(pvt->owner);
      ast_mutex_unlock(&pvt->owner->lock);
   }
   else {
      pvt->needhangup = 1;
      pvt->hangupcause = cause;
      ast_log(LOG_DEBUG, "Hangup for %s is pending\n", token);
   }
   ast_mutex_unlock(&pvt->lock);
}

void set_dtmf_payload(unsigned call_reference, const char *token, int payload)
{
   struct oh323_pvt *pvt;

   if (h323debug)
      ast_log(LOG_DEBUG, "Setting DTMF payload to %d on %s\n", payload, token);

   pvt = find_call_locked(call_reference, token);
   if (!pvt) {
      return;
   }
   if (pvt->rtp) {
      ast_rtp_set_rtpmap_type(pvt->rtp, payload, "audio", "telephone-event");
   }
   ast_mutex_unlock(&pvt->lock);
   if (h323debug)
      ast_log(LOG_DEBUG, "DTMF payload on %s set to %d\n", token, payload);
}

static void set_local_capabilities(unsigned call_reference, const char *token)
{
   struct oh323_pvt *pvt;
   int capability, dtmfmode;

   if (h323debug)
      ast_log(LOG_DEBUG, "Setting capabilities for connection %s\n", token);

   pvt = find_call_locked(call_reference, token);
   if (!pvt)
      return;
   capability = pvt->options.capability;
   dtmfmode = pvt->options.dtmfmode;
   ast_mutex_unlock(&pvt->lock);
   h323_set_capabilities(token, capability, dtmfmode);

   if (h323debug)
      ast_log(LOG_DEBUG, "Capabilities for connection %s is set\n", token);
}

static void *do_monitor(void *data)
{
   int res;
   int reloading;
   struct oh323_pvt *oh323 = NULL;
   
   for(;;) {
      /* Check for a reload request */
      ast_mutex_lock(&h323_reload_lock);
      reloading = h323_reloading;
      h323_reloading = 0;
      ast_mutex_unlock(&h323_reload_lock);
      if (reloading) {
         if (option_verbose > 0) {
            ast_verbose(VERBOSE_PREFIX_1 "Reloading H.323\n");
         }
         h323_do_reload();
      }
      /* Check for interfaces needing to be killed */
      ast_mutex_lock(&iflock);
restartsearch:    
      oh323 = iflist;
      while(oh323) {
         if (oh323->needdestroy) {
            __oh323_destroy(oh323);
            goto restartsearch;
         }
         oh323 = oh323->next;
      }
      ast_mutex_unlock(&iflock);
      pthread_testcancel();
      /* Wait for sched or io */
      res = ast_sched_wait(sched);
      if ((res < 0) || (res > 1000)) {
         res = 1000;
      }
      res = ast_io_wait(io, res);
      pthread_testcancel();
      ast_mutex_lock(&monlock);
      if (res >= 0) {
         ast_sched_runq(sched);
      }
      ast_mutex_unlock(&monlock);
   }
   /* Never reached */
   return NULL;
}

static int restart_monitor(void)
{
   pthread_attr_t attr;
   /* If we're supposed to be stopped -- stay stopped */
   if (monitor_thread == AST_PTHREADT_STOP) {
      return 0;
   }
   if (ast_mutex_lock(&monlock)) {
      ast_log(LOG_WARNING, "Unable to lock monitor\n");
      return -1;
   }
   if (monitor_thread == pthread_self()) {
      ast_mutex_unlock(&monlock);
      ast_log(LOG_WARNING, "Cannot kill myself\n");
      return -1;
   }
   if (monitor_thread && (monitor_thread != AST_PTHREADT_NULL)) {
      /* Wake up the thread */
      pthread_kill(monitor_thread, SIGURG);
   } else { 
      pthread_attr_init(&attr);
                pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
                /* Start a new monitor */
                if (ast_pthread_create(&monitor_thread, &attr, do_monitor, NULL) < 0) {
                        ast_mutex_unlock(&monlock);
                  pthread_attr_destroy(&attr);
                        ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
                        return -1;
                }
      pthread_attr_destroy(&attr);

   }
   ast_mutex_unlock(&monlock);
   return 0;
}

static int h323_do_trace(int fd, int argc, char *argv[])
{
   if (argc != 3) {
      return RESULT_SHOWUSAGE;
   }
   h323_debug(1, atoi(argv[2]));
   ast_cli(fd, "H.323 trace set to level %s\n", argv[2]);
   return RESULT_SUCCESS;
}

static int h323_no_trace(int fd, int argc, char *argv[])
{
   if (argc != 3) {
      return RESULT_SHOWUSAGE;
   }
   h323_debug(0,0);
   ast_cli(fd, "H.323 trace disabled\n");
   return RESULT_SUCCESS;
}

static int h323_do_debug(int fd, int argc, char *argv[])
{
   if (argc != 2) {
      return RESULT_SHOWUSAGE;
   }
   h323debug = 1;
   ast_cli(fd, "H323 debug enabled\n");
   return RESULT_SUCCESS;
}

static int h323_no_debug(int fd, int argc, char *argv[])
{
   if (argc != 3) {
      return RESULT_SHOWUSAGE;
   }
   h323debug = 0;
   ast_cli(fd, "H323 Debug disabled\n");
   return RESULT_SUCCESS;
}

static int h323_gk_cycle(int fd, int argc, char *argv[])
{
#if 0
   if (argc != 3) {
      return RESULT_SHOWUSAGE;
   }  
   h323_gk_urq();
   
   /* Possibly register with a GK */
   if (!gatekeeper_disable) {
      if (h323_set_gk(gatekeeper_discover, gatekeeper, secret)) {
         ast_log(LOG_ERROR, "Gatekeeper registration failed.\n");
      }
   }
#endif
   return RESULT_SUCCESS;
}

static int h323_ep_hangup(int fd, int argc, char *argv[])
{
        if (argc != 3) {
                return RESULT_SHOWUSAGE;
   }
   if (h323_soft_hangup(argv[2])) {
      ast_verbose(VERBOSE_PREFIX_3 "Hangup succeeded on %s\n", argv[2]);
   } else { 
      ast_verbose(VERBOSE_PREFIX_3 "Hangup failed for %s\n", argv[2]);
   }
   return RESULT_SUCCESS;
}

static int h323_tokens_show(int fd, int argc, char *argv[])
{
        if (argc != 3) {
                return RESULT_SHOWUSAGE;
   }
   h323_show_tokens();
   return RESULT_SUCCESS;
}

static char trace_usage[] = 
"Usage: h.323 trace <level num>\n"
"       Enables H.323 stack tracing for debugging purposes\n";

static char no_trace_usage[] = 
"Usage: h.323 no trace\n"
"       Disables H.323 stack tracing for debugging purposes\n";

static char debug_usage[] = 
"Usage: h.323 debug\n"
"       Enables H.323 debug output\n";

static char no_debug_usage[] = 
"Usage: h.323 no debug\n"
"       Disables H.323 debug output\n";

static char show_codec_usage[] = 
"Usage: h.323 show codec\n"
"       Shows all enabled codecs\n";

static char show_cycle_usage[] = 
"Usage: h.323 gk cycle\n"
"       Manually re-register with the Gatekeper (Currently Disabled)\n";

static char show_hangup_usage[] = 
"Usage: h.323 hangup <token>\n"
"       Manually try to hang up call identified by <token>\n";

static char show_tokens_usage[] = 
"Usage: h.323 show tokens\n"
"       Print out all active call tokens\n";

static char h323_reload_usage[] =
"Usage: h323 reload\n"
"       Reloads H.323 configuration from sip.conf\n";

static struct ast_cli_entry  cli_trace =
   { { "h.323", "trace", NULL }, h323_do_trace, "Enable H.323 Stack Tracing", trace_usage };
static struct ast_cli_entry  cli_no_trace =
   { { "h.323", "no", "trace", NULL }, h323_no_trace, "Disable H.323 Stack Tracing", no_trace_usage };
static struct ast_cli_entry  cli_debug =
   { { "h.323", "debug", NULL }, h323_do_debug, "Enable H.323 debug", debug_usage };
static struct ast_cli_entry  cli_no_debug =
   { { "h.323", "no", "debug", NULL }, h323_no_debug, "Disable H.323 debug", no_debug_usage };
static struct ast_cli_entry  cli_show_codecs =
   { { "h.323", "show", "codecs", NULL }, h323_show_codec, "Show enabled codecs", show_codec_usage };
static struct ast_cli_entry  cli_gk_cycle =
   { { "h.323", "gk", "cycle", NULL }, h323_gk_cycle, "Manually re-register with the Gatekeper", show_cycle_usage };
static struct ast_cli_entry  cli_hangup_call =
   { { "h.323", "hangup", NULL }, h323_ep_hangup, "Manually try to hang up a call", show_hangup_usage };
static struct ast_cli_entry  cli_show_tokens =
   { { "h.323", "show", "tokens", NULL }, h323_tokens_show, "Show all active call tokens", show_tokens_usage };

static int update_common_options(struct ast_variable *v, struct call_options *options)
{
   unsigned int format;
   int tmp;

   if (!strcasecmp(v->name, "allow")) {
      format = ast_getformatbyname(v->value);
      if (format < 1) 
         ast_log(LOG_WARNING, "Cannot allow unknown format '%s'\n", v->value);
      else
         options->capability |= format;
   } else if (!strcasecmp(v->name, "disallow")) {
      format = ast_getformatbyname(v->value);
      if (format < 1) 
         ast_log(LOG_WARNING, "Cannot disallow unknown format '%s'\n", v->value);
      else
         options->capability &= ~format;
   } else if (!strcasecmp(v->name, "dtmfmode")) {
      if (!strcasecmp(v->value, "inband")) {
         options->dtmfmode = H323_DTMF_INBAND;
      } else if (!strcasecmp(v->value, "rfc2833")) {
         options->dtmfmode = H323_DTMF_RFC2833;
      } else {
         ast_log(LOG_WARNING, "Unknown dtmf mode '%s', using rfc2833\n", v->value);
         options->dtmfmode = H323_DTMF_RFC2833;
      }
   } else if (!strcasecmp(v->name, "dtmfcodec")) {
      tmp = atoi(v->value);
      if (tmp < 96)
         ast_log(LOG_WARNING, "Invalid global dtmfcodec value %s\n", v->value);
      else
         options->dtmfcodec = tmp;
   } else if (!strcasecmp(v->name, "bridge")) {
      options->bridge = ast_true(v->value);
   } else if (!strcasecmp(v->name, "nat")) {
      options->nat = ast_true(v->value);
   } else if (!strcasecmp(v->name, "noFastStart")) {
      options->noFastStart = ast_true(v->value);
   } else if (!strcasecmp(v->name, "noH245Tunneling")) {
      options->noH245Tunneling = ast_true(v->value);
   } else if (!strcasecmp(v->name, "noSilenceSuppression")) {
      options->noSilenceSuppression = ast_true(v->value);
   } else if (!strcasecmp(v->name, "progress_setup")) {
      tmp = atoi(v->value);
      if ((tmp != 0) && (tmp != 1) && (tmp != 3) && (tmp != 8)) {
         ast_log(LOG_WARNING, "Invalid value %d for progress_setup at line %d, assuming 0\n", tmp, v->lineno);
         tmp = 0;
      }
      options->progress_setup = tmp;
   } else if (!strcasecmp(v->name, "progress_alert")) {
      tmp = atoi(v->value);
      if ((tmp != 0) && (tmp != 8)) {
         ast_log(LOG_WARNING, "Invalud value %d for progress_alert at line %d, assuming 0\n", tmp, v->lineno);
         tmp = 0;
      }
      options->progress_alert = tmp;
   } else if (!strcasecmp(v->name, "progress_audio")) {
      options->progress_audio = ast_true(v->value);
   } else
      return 1;

   return 0;
}

static struct oh323_alias *build_alias(char *name, struct ast_variable *v)
{
   struct oh323_alias *alias;

   alias = (struct oh323_alias *)malloc(sizeof(struct oh323_alias));
   if (alias) {
      memset(alias, 0, sizeof(struct oh323_alias));
      strncpy(alias->name, name, sizeof(alias->name) - 1);
      while (v) {
         if (!strcasecmp(v->name, "e164")) {
            strncpy(alias->e164,  v->value, sizeof(alias->e164) - 1);
         } else if (!strcasecmp(v->name, "prefix")) {
            strncpy(alias->prefix,  v->value, sizeof(alias->prefix) - 1);
         } else if (!strcasecmp(v->name, "context")) {
            strncpy(alias->context,  v->value, sizeof(alias->context) - 1);
         } else if (!strcasecmp(v->name, "secret")) {
            strncpy(alias->secret,  v->value, sizeof(alias->secret) - 1);
         } else {
            if (strcasecmp(v->value, "h323")) {    
               ast_log(LOG_WARNING, "Keyword %s does not make sense in type=h323\n", v->value);
            }
         }
         v = v->next;
      }
   }
   return alias;
}

static struct oh323_user *build_user(char *name, struct ast_variable *v)
{
   struct oh323_user *user;
   int format;

   user = (struct oh323_user *)malloc(sizeof(struct oh323_user));
   if (user) {
      memset(user, 0, sizeof(struct oh323_user));
      strncpy(user->name, name, sizeof(user->name) - 1);
      memcpy(&user->options, &global_options, sizeof(user->options));
      /* Set default context */
      strncpy(user->context, default_context, sizeof(user->context) - 1);
      while(v) {
         if (!strcasecmp(v->name, "context")) {
            strncpy(user->context, v->value, sizeof(user->context) - 1);
         } else if (!update_common_options(v, &user->options)) {
            /* dummy */
         } else if (!strcasecmp(v->name, "secret")) {
            strncpy(user->secret, v->value, sizeof(user->secret) - 1);
         } else if (!strcasecmp(v->name, "callerid")) {
            strncpy(user->callerid, v->value, sizeof(user->callerid) - 1);
         } else if (!strcasecmp(v->name, "accountcode")) {
            strncpy(user->accountcode, v->value, sizeof(user->accountcode) - 1);
         } else if (!strcasecmp(v->name, "host")) {
            if (!strcasecmp(v->value, "dynamic")) {
               ast_log(LOG_ERROR, "A dynamic host on a type=user does not make any sense\n");
               free(user);
               return NULL;
            } else if (ast_get_ip(&user->addr, v->value)) {
               free(user);
               return NULL;
            } 
            /* Let us know we need to use ip authentication */
            user->host = 1;
         } else if (!strcasecmp(v->name, "amaflags")) {
            format = ast_cdr_amaflags2int(v->value);
            if (format < 0) {
               ast_log(LOG_WARNING, "Invalid AMA Flags: %s at line %d\n", v->value, v->lineno);
            } else {
               user->amaflags = format;
            }
         }
         v = v->next;
      }
   }
   return user;
}

static struct oh323_peer *build_peer(char *name, struct ast_variable *v)
{
   struct oh323_peer *peer;
   struct oh323_peer *prev;
   struct ast_ha *oldha = NULL;
   int found=0;

   prev = NULL;
   ast_mutex_lock(&peerl.lock);
   peer = peerl.peers;

   while(peer) {
      if (!strcasecmp(peer->name, name)) {   
         break;
      }
      prev = peer;
      peer = peer->next;
   }

   if (peer) {
      found++;
      /* Already in the list, remove it and it will be added back (or FREE'd) */
      if (prev) {
         prev->next = peer->next;
      } else {
         peerl.peers = peer->next;
      }
      ast_mutex_unlock(&peerl.lock);
   } else {
      ast_mutex_unlock(&peerl.lock);
      peer = (struct oh323_peer*)malloc(sizeof(struct oh323_peer));
      if (peer)
         memset(peer, 0, sizeof(struct oh323_peer));
   }
   if (peer) {
      if (!found) {
         strncpy(peer->name, name, sizeof(peer->name) - 1);
         peer->addr.sin_port = htons(h323_signalling_port);
         peer->addr.sin_family = AF_INET;
      }
      oldha = peer->ha;
      peer->ha = NULL;
      peer->addr.sin_family = AF_INET;
      memcpy(&peer->options, &global_options, sizeof(peer->options));

      while(v) {
         if (!update_common_options(v, &peer->options)) {
            /* dummy */
         } else if (!strcasecmp(v->name, "host")) {
            if (!strcasecmp(v->value, "dynamic")) {
               ast_log(LOG_ERROR, "Dynamic host configuration not implemented.\n");
               free(peer);
               return NULL;
            }
            if (ast_get_ip(&peer->addr, v->value)) {
                  ast_log(LOG_ERROR, "Could not determine IP for %s\n", v->value);
                  free(peer);
                  return NULL;
            }
         } else if (!strcasecmp(v->name, "port")) {
            peer->addr.sin_port = htons(atoi(v->value));
         }
         v=v->next;
      }
   }
   return peer;
}

int reload_config(void)
{  
   int format;
   struct ast_config *cfg;
   struct ast_variable *v;
   struct oh323_peer *peer   = NULL;
   struct oh323_user *user   = NULL;
   struct oh323_alias *alias = NULL;
   struct ast_hostent ahp; struct hostent *hp;
   char *cat;
      char *utype;
   
   cfg = ast_config_load(config);

   /* We *must* have a config file otherwise stop immediately */
   if (!cfg) {
      ast_log(LOG_NOTICE, "Unable to load config %s, H.323 disabled\n", config);
      return 1;
   }
   
       /* fire up the H.323 Endpoint */       
   if (!h323_end_point_exist()) {
          h323_end_point_create();        
   }
   h323debug = 0;
   memset(&bindaddr, 0, sizeof(bindaddr));
   memset(&global_options, 0, sizeof(global_options));
   global_options.dtmfcodec = 101;
   global_options.dtmfmode = H323_DTMF_RFC2833;
   global_options.capability = AST_FORMAT_G723_1 | AST_FORMAT_GSM | AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_G729A | AST_FORMAT_H261;
   global_options.bridge = 1;    /* Do native bridging by default */
   v = ast_variable_browse(cfg, "general");
   while(v) {
      /* Create the interface list */
      if (!strcasecmp(v->name, "port")) {
         h323_signalling_port = (int)strtol(v->value, NULL, 10);
      } else if (!strcasecmp(v->name, "bindaddr")) {
         if (!(hp = ast_gethostbyname(v->value, &ahp))) {
            ast_log(LOG_WARNING, "Invalid address: %s\n", v->value);
         } else {
            memcpy(&bindaddr.sin_addr, hp->h_addr, sizeof(bindaddr.sin_addr));
         }
      } else if (!strcasecmp(v->name, "tos")) {
         if (sscanf(v->value, "%30d", &format)) {
            tos = format & 0xff;
         } else if (!strcasecmp(v->value, "lowdelay")) {
            tos = IPTOS_LOWDELAY;
         } else if (!strcasecmp(v->value, "throughput")) {
            tos = IPTOS_THROUGHPUT;
         } else if (!strcasecmp(v->value, "reliability")) {
            tos = IPTOS_RELIABILITY;
         } else if (!strcasecmp(v->value, "mincost")) {
            tos = IPTOS_MINCOST;
         } else if (!strcasecmp(v->value, "none")) {
            tos = 0;
         } else {
            ast_log(LOG_WARNING, "Invalid tos value at line %d, should be 'lowdelay', 'throughput', 'reliability', 'mincost', or 'none'\n", v->lineno);
         }
      } else if (!strcasecmp(v->name, "gatekeeper")) {
         if (!strcasecmp(v->value, "DISABLE")) {
            gatekeeper_disable = 1;
            usingGk = 0;
         } else if (!strcasecmp(v->value, "DISCOVER")) {
            gatekeeper_disable = 0;
            gatekeeper_discover = 1;
            usingGk = 1;
         } else {
            gatekeeper_disable = 0;
            usingGk = 1;
            strncpy(gatekeeper, v->value, sizeof(gatekeeper) - 1);
         }
      } else if (!strcasecmp(v->name, "secret")) {
         strncpy(secret, v->value, sizeof(secret) - 1);
      } else if (!strcasecmp(v->name, "AllowGKRouted")) {
         gkroute = ast_true(v->value);
      } else if (!strcasecmp(v->name, "context")) {
         strncpy(default_context, v->value, sizeof(default_context) - 1);
         ast_verbose(VERBOSE_PREFIX_2 "Setting default context to %s\n", default_context);   
      } else if (!strcasecmp(v->name, "UserByAlias")) {
         userbyalias = ast_true(v->value);
      } else if (!update_common_options(v, &global_options)) {
         /* dummy */
      }
      v = v->next;   
   }
   
   cat = ast_category_browse(cfg, NULL);
   while(cat) {
      if (strcasecmp(cat, "general")) {
         utype = ast_variable_retrieve(cfg, cat, "type");
         if (utype) {
            if (!strcasecmp(utype, "user")) {
               user = build_user(cat, ast_variable_browse(cfg, cat));
               if (user) {
                  ast_mutex_lock(&userl.lock);
                  user->next = userl.users;
                  userl.users = user;
                  ast_mutex_unlock(&userl.lock);
               }
            }  else if (!strcasecmp(utype, "peer")) {
               peer = build_peer(cat, ast_variable_browse(cfg, cat));
               if (peer) {
                  ast_mutex_lock(&peerl.lock);
                  peer->next = peerl.peers;
                  peerl.peers = peer;
                  ast_mutex_unlock(&peerl.lock);
               }
            }  else if (!strcasecmp(utype, "friend")) {
               user = build_user(cat, ast_variable_browse(cfg, cat));
               peer = build_peer(cat, ast_variable_browse(cfg, cat));
               if (user) {
                  ast_mutex_lock(&userl.lock);
                  user->next = userl.users;
                  userl.users = user;
                  ast_mutex_unlock(&userl.lock);
               }
               if (peer) {
                  ast_mutex_lock(&peerl.lock);
                  peer->next = peerl.peers;
                  peerl.peers = peer;
                  ast_mutex_unlock(&peerl.lock);
               }
            }  else if (!strcasecmp(utype, "h323") || !strcasecmp(utype, "alias")) {
               alias = build_alias(cat, ast_variable_browse(cfg, cat));
               if (alias) {
                  ast_mutex_lock(&aliasl.lock);
                  alias->next = aliasl.aliases;
                  aliasl.aliases = alias;
                  ast_mutex_unlock(&aliasl.lock);
               }
            } else {
               ast_log(LOG_WARNING, "Unknown type '%s' for '%s' in %s\n", utype, cat, config);
            }
         } else {
            ast_log(LOG_WARNING, "Section '%s' lacks type\n", cat);
         }
      }
      cat = ast_category_browse(cfg, cat);
   }
   ast_config_destroy(cfg);

   /* Register our H.323 aliases if any*/
   while (alias) {      
      if (h323_set_alias(alias)) {
         ast_log(LOG_ERROR, "Alias %s rejected by endpoint\n", alias->name);
         return -1;
      }  
      alias = alias->next;
   }

   return 0;
}

void delete_users(void)
{
   struct oh323_user *user, *userlast;
   struct oh323_peer *peer;
   
   /* Delete all users */
   ast_mutex_lock(&userl.lock);
   for (user=userl.users;user;) {
      userlast = user;
      user=user->next;
      free(userlast);
   }
   userl.users=NULL;
   ast_mutex_unlock(&userl.lock);
   ast_mutex_lock(&peerl.lock);
   for (peer=peerl.peers;peer;) {
      /* Assume all will be deleted, and we'll find out for sure later */
      peer->delme = 1;
      peer = peer->next;
   }
   ast_mutex_unlock(&peerl.lock);
}

void delete_aliases(void)
{
   struct oh323_alias *alias, *aliaslast;
      
   /* Delete all users */
   ast_mutex_lock(&aliasl.lock);
   for (alias=aliasl.aliases;alias;) {
      aliaslast = alias;
      alias=alias->next;
      free(aliaslast);
   }
   aliasl.aliases=NULL;
   ast_mutex_unlock(&aliasl.lock);
}

void prune_peers(void)
{
   /* Prune peers who still are supposed to be deleted */
   struct oh323_peer *peer, *peerlast, *peernext;
   ast_mutex_lock(&peerl.lock);
   peerlast = NULL;
   for (peer=peerl.peers;peer;) {
      peernext = peer->next;
      if (peer->delme) {
         free(peer);
         if (peerlast) {
            peerlast->next = peernext;
         } else {
            peerl.peers = peernext;
         }
      } else {
         peerlast = peer;
      }
      peer = peernext;
   }
   ast_mutex_unlock(&peerl.lock);
}

static int h323_reload(int fd, int argc, char *argv[])
{
   ast_mutex_lock(&h323_reload_lock);
   if (h323_reloading) {
      ast_verbose("Previous H.323 reload not yet done\n");
   } else {
      h323_reloading = 1;
   }
   ast_mutex_unlock(&h323_reload_lock);
   restart_monitor();
   return 0;
}

static int h323_do_reload(void)
{
   delete_users();
   delete_aliases();
   prune_peers();
   reload_config();
   restart_monitor();
   return 0;
}

int reload(void)
{
   return h323_reload(0, 0, NULL);
}

static struct ast_cli_entry  cli_h323_reload =
   { { "h.323", "reload", NULL }, h323_reload, "Reload H.323 configuration", h323_reload_usage };

static struct ast_rtp *oh323_get_rtp_peer(struct ast_channel *chan)
{
   struct oh323_pvt *pvt;
   pvt = (struct oh323_pvt *) chan->tech_pvt;
   if (pvt && pvt->rtp && pvt->options.bridge) {
      return pvt->rtp;
   }
   return NULL;
}

static struct ast_rtp *oh323_get_vrtp_peer(struct ast_channel *chan)
{
   return NULL;
}

static char *convertcap(int cap)
{
   switch (cap) {
   case AST_FORMAT_G723_1:
      return "G.723";
   case AST_FORMAT_GSM:
      return "GSM";
   case AST_FORMAT_ULAW:
      return "ULAW";
   case AST_FORMAT_ALAW:
      return "ALAW";
   case AST_FORMAT_ADPCM:
      return "G.728";
   case AST_FORMAT_G729A:
      return "G.729";
   case AST_FORMAT_SPEEX:
      return "SPEEX";
   case AST_FORMAT_ILBC:
      return "ILBC";
   default:
      ast_log(LOG_NOTICE, "Don't know how to deal with mode %d\n", cap);
      return NULL;
   }
}

static int oh323_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp, struct ast_rtp *vrtp, int codecs, int nat_active)
{
   /* XXX Deal with Video */
   struct oh323_pvt *pvt;
   struct sockaddr_in them;
   struct sockaddr_in us;
   char *mode;
   char iabuf[INET_ADDRSTRLEN];

   if (!rtp) {
      return 0;
   }

   mode = convertcap(chan->writeformat); 
   pvt = (struct oh323_pvt *) chan->tech_pvt;
   if (!pvt) {
      ast_log(LOG_ERROR, "No Private Structure, this is bad\n");
      return -1;
   }
   ast_rtp_get_peer(rtp, &them); 
   ast_rtp_get_us(rtp, &us);
   h323_native_bridge(pvt->cd.call_token, ast_inet_ntoa(iabuf, sizeof(iabuf), them.sin_addr), mode);
   return 0;
}

static struct ast_rtp_protocol oh323_rtp = {
   .type = type,
   .get_rtp_info = oh323_get_rtp_peer,
   .get_vrtp_info = oh323_get_vrtp_peer,
   .set_rtp_peer = oh323_set_rtp_peer,
};

int load_module()
{
   int res;
   ast_mutex_init(&userl.lock);
   ast_mutex_init(&peerl.lock);
   ast_mutex_init(&aliasl.lock);
   sched = sched_context_create();
   if (!sched) {
      ast_log(LOG_WARNING, "Unable to create schedule context\n");
   }
   io = io_context_create();
   if (!io) {
      ast_log(LOG_WARNING, "Unable to create I/O context\n");
   }
   res = reload_config();
   if (res) {
      return 0;
   } else {
      /* Make sure we can register our channel type */
      if (ast_channel_register(&oh323_tech)) {
         ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
         h323_end_process();
         return -1;
      }
      ast_cli_register(&cli_debug);
      ast_cli_register(&cli_no_debug);
      ast_cli_register(&cli_trace);
      ast_cli_register(&cli_no_trace);
      ast_cli_register(&cli_show_codecs);
      ast_cli_register(&cli_gk_cycle);
      ast_cli_register(&cli_hangup_call);
      ast_cli_register(&cli_show_tokens);
      ast_cli_register(&cli_h323_reload);

      ast_rtp_proto_register(&oh323_rtp);

      /* Register our callback functions */
      h323_callback_register(setup_incoming_call, 
                  setup_outgoing_call,                    
                  external_rtp_create, 
                  setup_rtp_connection, 
                  cleanup_connection, 
                  chan_ringing,
                  connection_made, 
                  send_digit,
                  answer_call,
                  progress,
                  set_dtmf_payload,
                  hangup_connection,
                  set_local_capabilities);
      /* start the h.323 listener */
      if (h323_start_listener(h323_signalling_port, bindaddr)) {
         ast_log(LOG_ERROR, "Unable to create H323 listener.\n");
         return -1;
      }
      /* Possibly register with a GK */
      if (!gatekeeper_disable) {
         if (h323_set_gk(gatekeeper_discover, gatekeeper, secret)) {
            ast_log(LOG_ERROR, "Gatekeeper registration failed.\n");
            return 0;
         }
      }
      /* And start the monitor for the first time */
      restart_monitor();
   }
   return res;
}

int unload_module() 
{
   struct oh323_pvt *p, *pl;

   /* unregister commands */
   ast_cli_unregister(&cli_debug);
   ast_cli_unregister(&cli_no_debug);
   ast_cli_unregister(&cli_trace);
   ast_cli_unregister(&cli_no_trace);   
   ast_cli_unregister(&cli_show_codecs);
   ast_cli_unregister(&cli_gk_cycle);
   ast_cli_unregister(&cli_hangup_call);
   ast_cli_unregister(&cli_show_tokens);
   ast_cli_unregister(&cli_h323_reload);
   ast_rtp_proto_unregister(&oh323_rtp);
   ast_channel_unregister(&oh323_tech);
      
   if (!ast_mutex_lock(&iflock)) {
      /* hangup all interfaces if they have an owner */
      p = iflist;
      while(p) {
         if (p->owner) {
            ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
         }
         p = p->next;
      }
      iflist = NULL;
      ast_mutex_unlock(&iflock);
   } else {
      ast_log(LOG_WARNING, "Unable to lock the interface list\n");
      return -1;
   }
   if (!ast_mutex_lock(&monlock)) {
      if (monitor_thread && (monitor_thread != AST_PTHREADT_STOP)) {
         /* this causes a seg, anyone know why? */
         pthread_cancel(monitor_thread);
         pthread_kill(monitor_thread, SIGURG);
         pthread_join(monitor_thread, NULL);
      }
      monitor_thread = AST_PTHREADT_STOP;
      ast_mutex_unlock(&monlock);
   } else {
      ast_log(LOG_WARNING, "Unable to lock the monitor\n");
      return -1;
   }
   if (!ast_mutex_lock(&iflock)) {
      /* destroy all the interfaces and free their memory */
      p = iflist;
      while(p) {
         pl = p;
         p = p->next;
         /* free associated memory */
         ast_mutex_destroy(&pl->lock);
         free(pl);
      }
      iflist = NULL;
      ast_mutex_unlock(&iflock);
   } else {
      ast_log(LOG_WARNING, "Unable to lock the interface list\n");
      return -1;
   }
   h323_gk_urq();
   h323_end_process();
   io_context_destroy(io);
   sched_context_destroy(sched);
   delete_users();
   delete_aliases();
   prune_peers();
   ast_mutex_destroy(&aliasl.lock);
   ast_mutex_destroy(&userl.lock);
   ast_mutex_destroy(&peerl.lock);
   return 0; 
} 

int usecount()
{
   return usecnt;
}

char *description()
{
   return (char *) desc;
}

char *key()
{
   return ASTERISK_GPL_KEY;
}