[cisco-voip] Gateway to G.729 Region calls

[Matthew Melbourne]

I've disabled G.729 Annexe B (Silence Suppression) in CallManager, and
this appears to have fixed the issue. I notice from the bug details
that this is fixed in CCM 4.1(3)sr3; we're running 4.1(3)sr2 with an
imminent upgrade to 4.1(3)sr5d.

Strangely, my transcoders broke, but worked after deleting them and
adding them back in. I suspect a CallManager service restart would
have had the same effect.

The gateways were on 12.4 (not 12.4T) but were recently upgraded to
12.4(15)T3 to upgrade the DSPware as we were encountering echo on TDM
calls (which we think it's fixed).

Many thanks for your help!

Cheers,

Matt

On 06/03/2008, Bill Talley <billt at aos5.com> wrote:
> Dug out my notes.  Here's the issue I ran into:
>
> CSCsc07492 Bug Details
>  Skinny (G729)-CCM-MGCP calls fail intermittently
> Symptoms:
>
> Calls from MGCP GW to IP phones via Call Mgr intermittently have dead air /
> no
> audio
>
> Conditions:
> Occurs when MGCP GW is using G729 to the phones and the IOS on the MGCP GW
> is
> 12.4.4T or higher 12.4T
>
> Workaround:
> - Disable G729 Annex B on the Call Manager
> - Make sure any transcoders / MTP resources on Call Mgr use only G729r8 and
> not
> G729ar8 / G729br8
>
>
>
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill Talley
> Sent: Thursday, March 06, 2008 7:54 AM
> To: Matthew Melbourne; cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] Gateway to G.729 Region calls
>
> I encountered this same scenario  problem awhile back and am fuzzy on the
> details, but I believe it had to do with silence suppression for g729 calls
> across a gateway... It's been quite awhile and I could be wrong, but I think
> that was case.  Had to disable it.
>
> *** Sent from a mobile device with very tiny keys.  Please excuse my typos.
> ***
>
>
>
> -----Original Message-----
> From: "Matthew Melbourne" <matt at melbourne.org.uk>
> To: "cisco-voip at puck.nether.net" <cisco-voip at puck.nether.net>
> Sent: 03/06/08 7:35 AM
> Subject: [cisco-voip] Gateway to G.729 Region calls
>
> Hi,
>
> I'm just setting up a Region for using G.729 across the WAN. In
> addition, we have introduced some transcoding resources for access to
> CRS and Unity (and this works fine using a G.729-only Region; I can
> see transcoding resources being invoked).
>
> However, more fundamentally, called entering the voice gateways from
> the PSTN, and destined for G.729-only handsets are being set up, but
> there is no audio (in either direction). If I place the call on hold
> on the IP Phone, the other end hears CCM MoH and when the call is
> released, the audio path is present, using the G.729 codec.
>
> On the gateway, I can see that the G.729 VOIP leg has been established
> (before and after the call is placed on hold):
>
> voice-gw1#sh call active voice compact | inc g729
> 49632 ORG     T781   g729br8     VOIP        P       10.80.2.42:16384
> 49631 ORG     T781   g729br8     TELE        P
>
> The gateways are MGCP-controlled and are running 12.4(15)T3.
>
> If I change the phone's Region to use G.711 only, then everything is fine.
>
> Cheers,
>
> Matt
>
> --
> Matthew Melbourne
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-- 
Matthew Melbourne