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

[Mark Boots]

Thanks for the help.  I'm working on a clean log.  We had many outgoing calls at the same time, the console log is mixed up with other calls.

Digging more into our logs, it seems the issue is sporadic: 50% of the time we can connect to a switch offering only PCMA, and other times we only offer PCMU and get this codec negotiation error.  The configuration has not changed across calls:

>>  <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"/>

I'll work on a console log and sip trace.  In the meantime, any idea what could cause variation between calls in the codecs offered?

+Mark



> From: Kristian Kielhofner <kris at kriskinc.com>
> Subject: Re: [Freeswitch-users] Error in codec negotiation: What are all the places that specify accepted codecs for outgoing calls?
> Date: 6 June 2014 18:17:47 GMT
> To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
> Reply-To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
> 
> 
> We would need to see a full siptrace and console log to see what's
> happening here.
> 
> On Fri, Jun 6, 2014 at 10:27 AM, Mark Boots <mark at votomobile.org> wrote:
>> 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
>> 
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>> 
>> 
>> 
>> 
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> 
> 
> 
> -- 
> Kristian Kielhofner

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