[Freeswitch-users] Codecs issue

Diego Viola diego.viola at gmail.com
Sun Jan 16 23:59:06 MSK 2011


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 at 32000h,G7221 at 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 at"/>

Here is a SIP trace of a call:


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:
provider IP:

calls flow like this:

softphone -> FS -> provider

Any help appreciated.

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