[Freeswitch-users] Number of codecs offerred in SDP

Mark Campbell-Smith mcampbellsmith at gmail.com
Wed Jun 23 16:32:21 PDT 2010 

FS version and codecs are shown below, but my config file are probably
quite old.  But I guess they should still work?

All codecs are loaded, and the call works if late negotiation is set
on profile internal.
As I wrote above:
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.

I forgot to write that Extension 1000 does not support GSM (I want to
force transcoding).  Is that why FS is filtering out GSM on the b-leg?

freeswitch at internal> version
FreeSWITCH Version 1.0.head (git-9b5778f 2010-06-19 14-49-15 -0500)

freeswitch at internal> show codecs
type,name,ikey
codec,ADPCM (IMA),mod_voipcodecs
codec,G.711 alaw,CORE_PCM_MODULE
codec,G.711 ulaw,CORE_PCM_MODULE
codec,G.722,mod_voipcodecs
codec,G.723.1 6.3k,mod_g723_1
codec,G.726 16k,mod_voipcodecs
codec,G.726 16k (AAL2),mod_voipcodecs
codec,G.726 24k,mod_voipcodecs
codec,G.726 24k (AAL2),mod_voipcodecs
codec,G.726 32k,mod_voipcodecs
codec,G.726 32k (AAL2),mod_voipcodecs
codec,G.726 40k,mod_voipcodecs
codec,G.726 40k (AAL2),mod_voipcodecs
codec,G.729,mod_com_g729
codec,GSM,mod_voipcodecs
codec,H.261 Video (passthru),mod_h26x
codec,H.263 Video (passthru),mod_h26x
codec,H.263+ Video (passthru),mod_h26x
codec,H.263++ Video (passthru),mod_h26x
codec,H.264 Video (passthru),mod_h26x
codec,LPC-10,mod_voipcodecs
codec,PROXY PASS-THROUGH,CORE_PCM_MODULE
codec,PROXY VIDEO PASS-THROUGH,CORE_PCM_MODULE
codec,RAW Signed Linear (16 bit),CORE_PCM_MODULE
codec,Speex,mod_speex

25 total.


On Wed, Jun 23, 2010 at 11:05 PM, David Ponzone <david.ponzone at gmail.com> wrote:
> Mark,
> I confirm that, as I wrote that wiki page (the early negotiation part) :)
> Can you really confirm your FS version ?
> The parameter you showed is old.
> codec-prefs has been replaced in SIP profiles by:
>     <param name="inbound-codec-prefs" value="$${global_codec_prefs}"/>
>     <param name="outbound-codec-prefs" value="$${outbound_codec_prefs}"/>
> David Ponzone  Direction Technique
> email: david.ponzone at ipeva.fr
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>
> Le 23/06/2010 à 14:43, Mark Campbell-Smith a écrit :
>
> 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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>
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>
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