[Asterisk-Users] G729 question

Clif Jones
Thu, 18 Dec 2003 13:34:21 -0000

Found it.  Anyone interested can look in RFC3551 "RTP Profile for Audio
and Video Conferences with Minimal Control".
You can piece together that G.729, G.729a & G.729b will play together
and the other annexes will not due to
bandwidth differences.

Clif Jones wrote:

> I am thinking about using the G729 codecs on my endpoint devices and
> purchasing some G729 licenses for Asterisk but I have several questions:
>
> 1. Which G729 codec is sold by Digium for Asterisk, G729, G729A, B...I?
> 2. If I have G729A on one end and G729B on the other, are they
> compatible?
>
> I have looked all over the place for question 2, but without buying
> the ITU docs
> I cannot seem to find this answer.  I know that G729A is low
> complexity which
> seems to be what Cisco 7960's use but I have some others that support
> G729B
> which has comfort noise and reduced transmission during silence.  If
> anyone knows
> how the different G729 codecs interoperate I would be eager to know.
> Thanks.
>
>
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