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@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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