[Freeswitch-users] Codec negotiation bug?

[Michael Collins]

On Fri, Apr 12, 2013 at 3:16 PM, Ken Rice <krice at freeswitch.org> wrote:

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

In other words, you have G729 listed in your codec prefs ahead of PCMA. If
you changed it to something like this it would probably work:

<X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=PCMA,PCMU,G729,GSM"/>
-MC


>
>
>
> 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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>
> --
> Ken
> *http://www.FreeSWITCH.org
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>
> _________________________________________________________________________
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> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
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>
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>


-- 
Michael S Collins
Twitter: @mercutioviz
http://www.FreeSWITCH.org
http://www.ClueCon.com
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