[Freeswitch-users] Number of codecs offerred in SDP

[Mark Campbell-Smith]

Check this good wiki page for how FS negotiates codecs (early
negotiation default):
http://wiki.freeswitch.org/wiki/Codec_Negotiation

I have this set in my internal profile:
    <param name="codec-prefs" value="$${global_codec_prefs}"/>

and as stated before vars.xml:
 <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G729,PCMU,GSM"/>
 <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=G729,PCMU,GSM"/>

Setting late negotiation works (thanks Sergey), but reading the wiki
page, I see the following sentence, which I interpret that GSM should
still be sent:
When FS calls leg B, the list of codecs in outbound-codec-prefs for
the SIP profile is reorganized by pushing the codec negotiated above
for leg A at the top . If B does not accept any of the codecs, the
calls fails, obviously.



On Wed, Jun 23, 2010 at 10:28 PM, Tony Graziano
<tgraziano at myitdepartment.net> wrote:
> I'm a newb to fs, but doesn't codec get neogtiated by the endpoints?
> Wouldn't fs only get involved when its media server is referred to?
>
> If the "other endpoint" will only accept G729, doesn't that mean you
> need to change that endpoint to also accept G711 or also license G729
> in FS?
>
> On 6/23/10, Mark Campbell-Smith <mcampbellsmith at gmail.com> wrote:
>> Test Setup:
>>
>> vars.xml:
>>   <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G729,PCMU,GSM"/>
>>   <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=G729,PCMU,GSM"/>
>>
>> The call setup is extension 1000 calls extension 1020
>> 1. Extension 1000 calls with preferred codec PCMU.  PCMU is chosen by
>> FS as the A-leg codec
>> 2. Extension 1020 only supports GSM codec.  The call fails with Not
>> Acceptable Here.
>>
>> FS only offers G729 and PCMU to 1020.  How do I change the number of
>> codecs that are offered to an extension?  I know I can change the
>> order in the codec_prefs, but would prefer FS to offer all three
>> codecs to an extension.
>>
>>    m=audio 23662 RTP/AVP 0 18 101 13
>>    a=rtpmap:0 PCMU/8000
>>    a=rtpmap:18 G729/8000
>>    a=rtpmap:101 telephone-event/8000
>>    a=fmtp:101 0-16
>>    a=rtpmap:13 CN/8000
>>    a=ptime:30
>>
>> Thanks
>>
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>
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