[Freeswitch-users] Codecs issue

[Diego Viola]

How do you understand these RTP/AVP numbers?

 m=audio 23344 RTP/AVP 3 18 98 99 9 0 8 101 13

What does the numbers mean? I don't see that on the wiki.

Any help appreciated.

On Sun, Jan 16, 2011 at 7:48 PM, David Ponzone <david.ponzone at ipeva.fr> wrote:
> 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 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 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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-- 
Diego Viola
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