[Freeswitch-users] Codec negotiation bug?

[Ken Rice]

You are prefing G729, so its going to try it first


On 4/12/13 5:00 PM, "Juan Antonio Ibañez Santorum" <juanito1982 at gmail.com>
wrote:

> Hello,
> 
>    I am doing some codec negotiation (early) tests but FS does not work as I
> expected.
> 
> I can read at wiki: "When FS calls leg B, the list of codecs in
> outbound-codec-prefs for the SIP profile is reorganized by pushing the codec
> negotiated above for leg A at the top. If B does not accept any of the codecs,
> the calls fails, obviously"
> 
> Codec prefs setted as:
> 
>   <X-PRE-PROCESS cmd="set"
> data="global_codec_prefs=G729,G7221 at 32000h,G7221 at 16000h,G722,PCMU,PCMA,GSM"/>
>   <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=G729,PCMU,PCMA,GSM"/>
> 
> FS select PCMA for A leg
> 
> FS offers following SDP to B leg:
> 
>  v=0
>    o=FreeSWITCH 1365781615 1365781616 IN IP4 176.31.117.49
>    s=FreeSWITCH
>    c=IN IP4 176.31.117.49
>    t=0 0
>    m=audio 19780 RTP/AVP 8 101 13
>    a=rtpmap:101 telephone-event/8000
>    a=fmtp:101 0-16
>    a=ptime:30
>    m=audio 19780 RTP/AVP 18 0 8 3 101 13
>    a=rtpmap:101 telephone-event/8000
>    a=fmtp:101 0-16
>    a=ptime:20
> 
> Session progress from B leg contains:
> 
>    v=0
>    o=root 3311 3311 IN IP4 91.192.110.234
>    s=session
>    c=IN IP4 91.192.110.234
>    t=0 0
>    m=audio 16194 RTP/AVP 18 8 0 101
>    a=rtpmap:18 G729/8000
>    a=fmtp:18 annexb=no
>    a=rtpmap:8 PCMA/8000
>    a=rtpmap:0 PCMU/8000
>    a=rtpmap:101 telephone-event/8000
>    a=fmtp:101 0-16
>    a=silenceSupp:off - - - -
>    a=ptime:20
>    a=sendrecv
> 
> FS codec comparison debug look as:
> 
> sofia_glue.c:5094 Audio Codec Compare
> [G729:18:8000:20:8000]/[PCMA:8:8000:30:64000]
> sofia_glue.c:5094 Audio Codec Compare
> [G729:18:8000:20:8000]/[G729:18:8000:20:8000]
> sofia_glue.c:3077 Set Codec sofia/external/0034950004588 G729/8000 20 ms 160
> samples 8000 bits
> 
> FS start comparing G729 instead PCMA selected in A leg
> 
> Is that ok? is there any way to get selected PCMA for B leg without using late
> negotiation nor disabling transcoding
> 
> Regards
> 
> 
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
> 
> 
> 
> 
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-- 
Ken
http://www.FreeSWITCH.org
http://www.ClueCon.com
http://www.OSTAG.org
irc.freenode.net #freeswitch

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