[Freeswitch-users] absolute_codec_string question

[David Ponzone]

Nicolas,

it's because the payload type for G729 is an old static one.
Speex doesnt have its own static payload type, as all the recent codecs. It's dynamic, so a fmtp line is required.

For your issue with 2 codecs, that's not normal.
Are you sure you did reloadxml ?

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Le 25/04/2011 à 18:22, Nicolas Brenner a écrit :

> Thanks Paul!
> 
> You are totally right, I was looking for the a=rtpmap:18 G729/8000 line. I find it weird that it is automatically inserted for SPEEX, but not for other codecs.
> 
> Another thing I noticed, is I can't specify more than one codec, according to what I've read about other issues, this has something to do with a comma parsing problem on the console (for some reason commas can't be escaped, this also affects trying to originate calls from ESL).
> 
> So for absolute_codec_string=G729 I get this SDP (with verbose_sdp=true):
> 
>    v=0
>    o=FreeSWITCH 1303718366 1303718367 IN IP4 127.0.0.1
>    s=FreeSWITCH
>    c=IN IP4 127.0.0.1
>    t=0 0
>    m=audio 29882 RTP/AVP 18 101 13
>    a=rtpmap:18 G729/8000
>    a=rtpmap:101 telephone-event/8000
>    a=fmtp:101 0-16
>    a=ptime:20
> 
> 
> But for absolute_codec_string=G729,PCMU I get no additional m= lines in the SDP:
> 
>    v=0
>    o=FreeSWITCH 1303716332 1303716333 IN IP4 127.0.0.1
>    s=FreeSWITCH
>    c=IN IP4 127.0.0.1
>    t=0 0
>    m=audio 32008 RTP/AVP 18 101 13
>    a=rtpmap:18 G729/8000
>    a=rtpmap:101 telephone-event/8000
>    a=fmtp:101 0-16
>    a=ptime:20
> 
> 
> 
> 
> On Mon, Apr 25, 2011 at 12:06 PM, Paul Cupis <paul at cupis.co.uk> wrote:
> On 25/04/11 16:22, Nicolas Brenner wrote:
> > I'm trying to force the use of a specific codec when originating a call from
> > the command line.
> 
> >    m=audio 17054 RTP/AVP 0 8 98 18 101 13
> 
> >    m=audio 24894 RTP/AVP 0 101 13
> 
> > And it doesn't matter the value I give to the absolute_codec_string, I will
> > get the same SDP, except if I specify SPEEX, then I'll get the same SDP as
> > the one above. Am I missing something, or is this the way it's supposed to
> > work?
> 
> Looks okay to me. Perhaps you are not looking at the m=audio line in the
> SDP which you will is different - this reflects the difference in the
> offered codecs.
> 
> You might be expecting to see all of the codecs itemised in the a=fmtp
> lines - this is known as verbose-sdp and is disabled by default.
> 
> Have a look at:
> http://wiki.freeswitch.org/wiki/Variable_verbose_sdp
> 
> Regards,
> 
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