<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Nicolas,<div><br></div><div>it's because the payload type for G729 is an old static one.</div><div>Speex doesnt have its own static payload type, as all the recent codecs. It's dynamic, so a fmtp line is required.</div><div><br></div><div>For your issue with 2 codecs, that's not normal.</div><div>Are you sure you did reloadxml ?</div><div><br><div>
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<br><div><div>Le 25/04/2011 à 18:22, Nicolas Brenner a écrit :</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Thanks Paul!</div><div><br></div>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.<div><br></div><div>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).</div>
<div><br></div><div>So for absolute_codec_string=G729 I get this SDP (with verbose_sdp=true):</div><div><br></div><div><div> v=0</div><div> o=FreeSWITCH 1303718366 1303718367 IN IP4 127.0.0.1</div><div> s=FreeSWITCH</div>
<div> c=IN IP4 127.0.0.1</div><div> t=0 0</div><div> m=audio 29882 RTP/AVP 18 101 13</div><div> a=rtpmap:18 G729/8000</div><div> a=rtpmap:101 telephone-event/8000</div><div> a=fmtp:101 0-16</div>
<div> a=ptime:20</div></div><div><br></div><div><br></div><div>But for absolute_codec_string=G729,PCMU I get no additional m= lines in the SDP:</div><div><br></div><div><div> v=0</div><div> o=FreeSWITCH 1303716332 1303716333 IN IP4 127.0.0.1</div>
<div> s=FreeSWITCH</div><div> c=IN IP4 127.0.0.1</div><div> t=0 0</div><div> m=audio 32008 RTP/AVP 18 101 13</div><div> a=rtpmap:18 G729/8000</div><div> a=rtpmap:101 telephone-event/8000</div>
<div> a=fmtp:101 0-16</div><div> a=ptime:20</div></div><div><br></div><div><br><div><br><br><div class="gmail_quote">On Mon, Apr 25, 2011 at 12:06 PM, Paul Cupis <span dir="ltr"><<a href="mailto:paul@cupis.co.uk">paul@cupis.co.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="im">On 25/04/11 16:22, Nicolas Brenner wrote:<br>
> I'm trying to force the use of a specific codec when originating a call from<br>
> the command line.<br>
<br>
</div><div class="im">> m=audio 17054 RTP/AVP 0 8 98 18 101 13<br>
<br>
</div><div class="im">> m=audio 24894 RTP/AVP 0 101 13<br>
<br>
</div><div class="im">> And it doesn't matter the value I give to the absolute_codec_string, I will<br>
> get the same SDP, except if I specify SPEEX, then I'll get the same SDP as<br>
> the one above. Am I missing something, or is this the way it's supposed to<br>
> work?<br>
<br>
</div>Looks okay to me. Perhaps you are not looking at the m=audio line in the<br>
SDP which you will is different - this reflects the difference in the<br>
offered codecs.<br>
<br>
You might be expecting to see all of the codecs itemised in the a=fmtp<br>
lines - this is known as verbose-sdp and is disabled by default.<br>
<br>
Have a look at:<br>
<a href="http://wiki.freeswitch.org/wiki/Variable_verbose_sdp" target="_blank">http://wiki.freeswitch.org/wiki/Variable_verbose_sdp</a><br>
<br>
Regards,<br>
<br>
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