That sounds like a bad reading of the trace.

The important line is the 239th:
 m=audio 23344 RTP/AVP 3 18 98 99 9 0 8 101 13

That means codec 3 is sent first (so GSM), then 18 (so G729).

I think you should read a little bit on early negotiation.
If leg A has GSM in 1st position, if your inbound codec list allows GSM, and your outbound codec list is : G729, PCM, GSM, than your outbound INVITE to leg B will have GSM in 1st position, because that was requested by leg A.

That's in the wiki, it's a part I rewrote myself some weeks ago, in the most readable way I could.

David Ponzone  Direction Technique
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Le 16/01/2011 à 21:59, Diego Viola a écrit :

Hello,

I'm experiencing some strange issue with codecs. I have the following
in my vars.xml file:

 <X-PRE-PROCESS cmd="set"
data="global_codec_prefs=G729,G7221@32000h,G7221@16000h,G722,PCMU,PCMA,GSM"/>
 <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=G729,PCMU,PCMA,GSM"/>

"inbound-late-negotiation" and "disable-transcoding" are commented in
my internal SIP profile. So I guess I'm in Early Negotiation (default
behavior) mode.

However, when I send a call to my provider, and I look at the SIP
trace I see that FS is sending another codec, not G729 as I specified
in the global_codec_prefs / outbound_codec_prefs parameters.

I'm sending calls like this:

       <action application="bridge" data="sofia/internal/$1@38.102.93.70"/>

Here is a SIP trace of a call:

http://pastebin.freeswitch.org/15042

I'm not understanding why FS is sending an INVITE with the G7221 codec
in line 240, if I'm telling it explicitly that I want G729 as the
priority when possible in the codec prefs options. But I see G729 in
the 200 OK in line 291.

I've been told to use absolute_codec_string=G729 in my dialplan or
enable late negotiation, but why if I'm already telling it to use G729
in the codec prefs?

my softphone IP: 190.23.80.10
provider IP: 38.102.93.70
FS IP: 77.92.65.126

calls flow like this:

softphone -> FS -> provider

Any help appreciated.

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