Thu Apr 16 06:48:10 2015

Asterisk developer's documentation

Audio Codec Preferences

In order to negotiate audio codecs in the order they are configured in <channel>.conf for a device, we set up codec preference lists in addition to the codec capabilities setting. The capabilities setting is a bitmask of audio and video codecs with no internal order. This will reflect the offer given to the other side, where the prefered codecs will be added to the top of the list in the order indicated by the "allow" lines in the device configuration.

Video codecs are not included in the preference lists since they can't be transcoded and we just have to pick whatever is supported

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