[cisco-voip] g729 gateway / transcoding?

[Zoltan.Kelemen at emerson.com]

Thanks Ryan.

That's also a good point about annex b, hopefully I can convince others on the team as well to give up VAD :)

Cheers,
  Zoltan

________________________________
From: Ryan Ratliff [rratliff at cisco.com]
Sent: Monday, January 28, 2013 5:54 PM
To: Kelemen, Zoltan [CORP/RO]
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] g729 gateway / transcoding?

You would only need transcoding if you have call flows that could connect this gateway to a device across the wan that doesn't support g729.    In that case if you still want to have g729 go across the wan you'd need to be transcoding to 711 at the central site, not at the remote site gateway.

As far as the dial-peer goes I'd recommend a codec class with all the variants of 729 (that don't have 'b' in them) to prevent potential failures because of variations in codec support across your devices or other gateways.  You don't want to use g729b because it includes voice activity detection (vad) and will cause even poorer voice quality than you'll be getting with 729.

-Ryan

On Jan 28, 2013, at 4:43 AM, Zoltan.Kelemen at emerson.com<mailto:Zoltan.Kelemen at emerson.com> wrote:

Hi,

This may be a very basic question, but I’m looking for a straight forward answer, and so far couldn’t find anything.

I have a remote voice gateway, with an E1 card connecting to a PBX on one end and SIP trunk towards the WAN on the other.
On the WAN I’d like to have g729.

The router has a PVDM3-64 inside.

Do I need to set up transcoding as well, or is it enough to specify
codec g729br8
on the voip dial-peer?

Thanks,

Zoltan Kelemen
Emerson

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