[cisco-voip] Changing Codec from G711 to G729

[Tim Smith]

The Unity part is not true. Unity supports G729 as well, it will transcode
in software.
You can disable this transcoding to force Unity to use an external
transcoder for load balancing / offload reasons.

SRND for CUCM and Design Guide for Unity cover all of this stuff quite
nicely.

Agree with John on the conf bridge side, definitely a good idea to put
hardware resources out on the edge sites, and ensure you understand and
configure your MRGs and MRGLs to use the resources correctly.

The conference calls will probably be failing because your software
resources on CUCM servers do not support G729. If they receive a G729 setup
attempt, they would be trying to locate a transcoder to convert it to G711,
if no go, then the call would fail.

Cheers,

Tim.

On Wed, Sep 8, 2010 at 3:25 PM, <John.VanLaecke at ghd.com> wrote:

> Saboor,
>
> You will need to configure a transcoder within your network.
> within the company that i work for we use the site router as the transcoder
> / conference bridge.
> internal voip calls are g729 and external is g711, Unity only supports g711
>
>
>
>
> Regards,
> *
> John Van Laecke **
> Network Administrator **
> **
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>  From: Saboor Khan <saboor.khan at gmail.com> To: cisco-voip at puck.nether.net
> Date: 08/09/2010 03:04 PM Subject: [cisco-voip] Changing Codec from G711
> to G729 Sent by: cisco-voip-bounces at puck.nether.net
> ------------------------------
>
>
>
> Hi,
>
> Can any one experience of changing Codec in big network environment, we
> have around 150 branches with Mix PRI and FXO based Gateways, we have UCC
> running for 5 Branches and running G711 Codec, our Voicemail Unity 4 is
> running on G711, here is the million dollar question, can any one have some
> startup documentation where i can start this and follow Cisco standards,
> which includes hardware resources where we cannot change codec to do
> Conference call as it is pretty common in our company, but we see that our
> conference calls fails due to mismatch of codecs.
>
>
> Regards,
>
> Saboor
>
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