[Freeswitch-users] Codecs issue

Mon Jan 17 02:25:20 MSK 2011

Also, I noticed this on the wiki, in the Early Negotiation example.

A -------- GSM/PCMA/G729 --------> FS (allowing G729/PCMA/PCMU)
-------- PCMA/G729/PCMU --------> B

Shouldn't that be:

A -------- GSM/PCMA/G729 --------> FS (allowing G729/PCMA/PCMU)
-------- G729/PCMA/PCMU --------> B

instead?

On Sun, Jan 16, 2011 at 8:24 PM, Diego Viola <diego.viola at gmail.com> wrote:
> Thanks, I will read that
>
> On Sun, Jan 16, 2011 at 8:21 PM, Steven Ayre <steveayre at gmail.com> wrote:
>> It's part of the RTP/SDP standards. They're either static or dynamic
>> numbers.
>>
>> Dynamic ones (96-127) are named by name in a=rtpmap lines.
>>
>> Static numbers are reserved numbers and the a=rtpmap is allowed but optional
>> (although some devices incorrectly require it)
>> The list of reserved static numbers is:
>> http://www.iana.org/assignments/rtp-parameters
>>
>> -Steve
>>
>>
>> On 16 January 2011 23:18, Diego Viola <diego.viola at gmail.com> wrote:
>>>
>>> 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
>>> > email: david.ponzone at ipeva.fr
>>> > tel:      01 74 03 18 97
>>> > gsm:   06 66 98 76 34
>>> > Service Client IPeva
>>> > tel:      0811 46 26 26
>>> > www.ipeva.fr  -   www.ipeva-studio.com
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>>> > message, merci de le détruire immédiatement et d'avertir l'expéditeur.
>>> >
>>> >
>>> >
>>> > 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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>>> >
>>> >
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>>> >
>>> >
>>>
>>>
>>>
>>> --
>>> Diego Viola
>>> Representative of Bridgecom LLC
>>> Phone: +595 971 320 520
>>> GTalk: diego.viola at gmail.com
>>> MSN: diegoev at msn.com
>>> LinkedIn: http://www.linkedin.com/pub/diego-viola/15/886/609
>>> www.bridgecom.com.py
>>>
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>>
>>
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>>
>
>
>
> --
> Diego Viola
> Representative of Bridgecom LLC
> Phone: +595 971 320 520
> GTalk: diego.viola at gmail.com
> MSN: diegoev at msn.com
> LinkedIn: http://www.linkedin.com/pub/diego-viola/15/886/609
> www.bridgecom.com.py
>

-- 
Diego Viola
Representative of Bridgecom LLC
Phone: +595 971 320 520
GTalk: diego.viola at gmail.com
MSN: diegoev at msn.com
LinkedIn: http://www.linkedin.com/pub/diego-viola/15/886/609
www.bridgecom.com.py