Hi All,

I'm not really sure if I got a firm answer for this one.  Is the only
way to ensure that transcoding is performed is by using
late-negotiation?  Why aren't all my codecs sent in the INVITE message
to the B-leg (extension 1020)?

Thanks!

On Thu, Jun 24, 2010 at 9:32 AM, Mark Campbell-Smith
<mcampbellsmith@gmail.com> wrote:

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@internal> version

FreeSWITCH Version 1.0.head (git-9b5778f 2010-06-19 14-49-15 -0500)

freeswitch@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@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}"/>

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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@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@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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