[Freeswitch-users] Codecs issue

Mon Jan 17 02:25:32 MSK 2011

http://wiki.freeswitch.org/wiki/Codec_Negotiation

On Sun, Jan 16, 2011 at 8:25 PM, Diego Viola <diego.viola at gmail.com> wrote:
> 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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>>>> > l'intention exclusive de ses destinataires. Toute utilisation ou
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>>>> > non autorisée est interdite. Tout message électronique est susceptible
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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
>


-- 
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