[cisco-voip] Codec change issue

[Roger Wiklund]

"G711 to G729 for a handful of our remote branches"

Sounds like codec mismatch, if you have an active G729 only call and
you conferense in a G711 phone you will get the same problem you're
having. I.E it rings and as soon as you answer the call disconnects.

To overcome that you need transcode resources on a Cisco gateway.

For regular calls, as James aid, if you're running H.323 ensure you
have a voice class codec with G729 as first prio then G711a/ulaw as 2
and 3. That way the gateway should be able to adapt if phones have
have different codecs.



On Mon, Apr 30, 2012 at 5:39 PM, James Dust
<james.dust at charles-stanley.co.uk> wrote:
> Afternoon All,
>
>
>
> We have recently changed our codec from G711 to G729 for a handful of our
> remote branches. We achieved this by changing the region on CUCM and
> updating our branch voice gateway by applying the preferred codec onto all
> the relevant dial peers.
>
>
>
> However, we have had some examples of the following scenario:
>
>
>
> Calls to an IP phone through a gateway fail when a transfer to another phone
> is attempted. The user picking up the transferred call receives a busy tone
> and then the call disconnects.
>
>
>
> The voice gateway in question shows the incoming call codec as G729 and no
> errors appear when we apply a debug to the router.
>
>
>
> Voice Gateway: 2801 (IOS - 12.4T)
>
> CUCM Version: 7.1(3)
>
> 7970 phones
>
>
>
> Has anyone come across this? Would be handy to know before I attempt to
> setup alerts on RTMT.
>
>
>
>
>
> Kind Regards
>
>
>
> James Dust
> Team Leader
> ICT Network Infrastructure & Communications Department
> Charles Stanley & Co Ltd
> Tel: 020 7149 6314
> Mob: 07989 491136
> mailto: james.dust at charles-stanley.co.uk
>
>
>
>
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