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Summary:ASTERISK-25633: chan_sip: Codec preference misorder
Reporter:Yury Tsaregorodtsev (aero.108)Labels:
Date Opened:2015-12-16 17:19:07.000-0600Date Closed:2015-12-20 17:56:15.000-0600
Priority:CriticalRegression?
Status:Closed/CompleteComponents:Channels/chan_sip/CodecHandling
Versions:11.20.0 Frequency of
Occurrence
Related
Issues:
Environment:Ubuntu 15.10Attachments:
Description:Asterisk misorder incoming leg codec preference.
Incoming SDP:
m=audio 24636 RTP/AVP 8 0 18 4 101
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:4 G723/8000


sip.conf
disallow=all
allow=g729,alaw,ulaw,gsm,g723


result:
[2015-12-16 23:04:20.353] DEBUG[4442][C-00011a0e] chan_sip.c: *** Our native formats are (g729)
[2015-12-16 23:04:20.353] DEBUG[4442][C-00011a0e] chan_sip.c: *** Joint capabilities are (g723|ulaw|alaw|g729)
[2015-12-16 23:04:20.353] DEBUG[4442][C-00011a0e] chan_sip.c: *** Our capabilities are (g723|gsm|ulaw|alaw|g729)
[2015-12-16 23:04:20.353] DEBUG[4442][C-00011a0e] chan_sip.c: *** AST_CODEC_CHOOSE formats are g729

Right codec suppose to be ALAW.
Comments:By: Asterisk Team (asteriskteam) 2015-12-16 17:19:09.145-0600

Thanks for creating a report! The issue has entered the triage process. That means the issue will wait in this status until a Bug Marshal has an opportunity to review the issue. Once the issue has been reviewed you will receive comments regarding the next steps towards resolution.

A good first step is for you to review the [Asterisk Issue Guidelines|https://wiki.asterisk.org/wiki/display/AST/Asterisk+Issue+Guidelines] if you haven't already. The guidelines detail what is expected from an Asterisk issue report.

Then, if you are submitting a patch, please review the [Patch Contribution Process|https://wiki.asterisk.org/wiki/display/AST/Patch+Contribution+Process].
By: Joshua C. Colp (jcolp) 2015-12-20 17:56:15.400-0600

Currently in chan_sip the codec preference order is enforced based on the configuration of the server. As a result given the configuration you've provided and the SDP the chosen codec would be g729, not alaw. You may want to bring your problem up on the asterisk-users mailing list and see if others have a solution which would work for you.