[Freeswitch-users] Codec Negotiation Help

[DJB International]

Your profile has late negotion enabled.  I believe you can set
inherit_codec=true, so that it will force A leg to use the same codec as B
leg offered.


On Thu, May 26, 2011 at 9:04 AM, Spencer Thomason <
spencer at 5ninesolutions.com> wrote:

> Hello all,
> I have a problem regarding the codec negotiation on an outbound call.  My
> setup is like this:
>
> Polycom IP 650 (1-n) -NAT-> FS  --> Our Signaling Proxy --> ITSP Proxy --->
> ITSP Cisco GW
>
> I'd like to use different codecs for different call paths (in order of
> pref), g729 in passthru only:
> IP-650         ->  IP-650   G722, PCMU, G729
> Inbound      ->  IP-650   PCMU
> IP-650         ->  Outbound PCMU,G729
>
> I have two sofia profiles, internal, public IPv4:5060 and external,
> public:IPv4:5080.
>
> The phones use the internal profile and the external profile only
> communicates with our signaling proxy (no media proxy).
> On the internal one:
> CODECS IN               G722,PCMU,G729,GSM
> CODECS OUT              G722,PCMU,G729,GSM
> NOMEDIA                 false
> LATE-NEG                true
>
> External:
> CODECS IN               PCMU,G729
> CODECS OUT              PCMU,G729
> NOMEDIA                 false
> LATE-NEG                true
>
> I have inbound-codec-negotiation set to greedy on both profiles and on
> outbound calls set absolute_codec_string=PCMU,G729 to prevent transcoding.
>  Note that mod_g729 is enabled for passthru only.
>
> The problem I have is this:
> We use the dynamic routing module in OpenSIPS to select an outbound
> provider/GW, all support PCMU and G729.  On one of the routes, the Cisco IOS
> GW on this route has G729, PCMU configured as its codec pref.
>
> I have included a ladder diagram to better illustrate the problem but in a
> nutshell, the polycom negotiates PCMU with FS, FS asks for both PCMU and
> G729, the cisco GW sends G729 and FS sends a 488 because it can't transcode.
>  I would like to keep G729 in the outbound prefs because some routes might
> not support PCMU.  Should I set one of the profiles to generous, and if so
> which one?
>
> When someone makes an outbound call the following happens (ladder diagram):
> http://pastebin.freeswitch.org/16380
>
>
> Sorry for the novella, :-)
>
> Thanks!
> Spencer
>
>
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