[Freeswitch-users] Error in codec negotiation: What are all the places that specify accepted codecs for outgoing calls?

[Mark Boots]

We're using a major VoIP terminator and finding that on many outgoing calls, Freeswitch hangs up with INCOMPATIBLE_DESTINATION after trying to negotiate codecs.

The carrier offers PCMA, and it looks like Freeswitch refuses to accept anything but PCMU:


2014-06-06 13:18:54.115197 [NOTICE] sofia_media.c:92 Pre-Answer sofia/external/0011104555493618652!
2014-06-06 13:18:54.115197 [DEBUG] switch_channel.c:3277 (sofia/external/0011104555493618652) Callstate Change DOWN -> EARLY
2014-06-06 13:18:54.175210 [DEBUG] switch_core_session.c:1005 Send signal sofia/external/0011104555391494140 [BREAK]
2014-06-06 13:18:54.175210 [DEBUG] switch_core_session.c:1005 Send signal sofia/external/0011104555391494140 [BREAK]
2014-06-06 13:18:54.175210 [DEBUG] sofia.c:5741 Channel sofia/external/0011104555391494140 entering state [proceeding][183]
2014-06-06 13:18:54.175210 [DEBUG] sofia.c:5750 Remote SDP:
v=0
o=- 313783328916230866 1 IN IP4 81.52.176.165
s=-
c=IN IP4 81.52.176.165
t=0 0
a=sendrecv
m=audio 25080 RTP/AVP 8 13 101
a=rtpmap:8 PCMA/8000
a=rtpmap:13 CN/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

2014-06-06 13:18:54.175210 [DEBUG] switch_core_media.c:2585 Set comfort noise payload to 13
2014-06-06 13:18:54.175210 [DEBUG] switch_core_media.c:2662 Audio Codec Compare [PCMA:8:8000:20:64000]/[PCMU:0:8000:20:64000]
2014-06-06 13:18:54.175210 [DEBUG] switch_core_media.c:2662 Audio Codec Compare [CN:13:8000:20:0]/[PCMU:0:8000:20:64000]
2014-06-06 13:18:54.175210 [DEBUG] switch_core_media.c:2662 Audio Codec Compare [telephone-event:101:8000:20:0]/[PCMU:0:8000:20:64000]
2014-06-06 13:18:54.175210 [DEBUG] switch_core_media.c:2824 Set 2833 dtmf send payload to 101
2014-06-06 13:18:54.175210 [DEBUG] switch_core_session.c:1005 Send signal sofia/external/0011104555391494140 [BREAK]
2014-06-06 13:18:54.175210 [NOTICE] sofia.c:5868 Hangup sofia/external/0011104555391494140 [CS_CONSUME_MEDIA] [INCOMPATIBLE_DESTINATION]


However, our codec settings in vars.xml specify:

  <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G722,PCMU,PCMA,GSM"/>
  <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=PCMU,PCMA,GSM"/>

The sip profile uses these settings.  Any idea how to debug what codecs Freeswitch is willing to accept?

Thanks!
+Mark
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