[Asterisk-Users] G729 question

[Clif Jones]

My understanding is that if the codec type matches on each leg of the 
call then
Asterisk is using "pass through".  The PBX simply has to relay the RTP 
packets
unchanged from one device to another.  If you are going from a phone using
codec tupe A to codec type B, Asterisk must perform a conversion which 
requires
support for both codecs.

iTS Consult at ncy wrote:

>Hi, where can I find info on configuring pass-through mode.
>
>-----Original Message-----
>From: asterisk-users-admin at lists.digium.com
>[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of SW
>Sent: Jueves, 18 de Diciembre de 2003 11:29 p.m.
>To: asterisk users
>Cc: Clif Jones
>Subject: [Asterisk-Users] G729 question
>
>
>Hi Clif,
>
>My experience with G.729 and asterisk is not good.
>
>My first registration was good, it worked. Then I bought more license and
>tried to upgrade it, it blew everything off. Still waiting Digium support to
>give me a helping hand.
>
>If you use pass-through feature then I guess you are fine. I have SIP users
>going to h.323 g/w and I need g.729. So now I have it in pass-through mode,
>I think that requires less CPU overhead and I do not have to mess with
>licenses.
>
>Cheers
>
>SW
>
>Message: 5
>Date: Thu, 18 Dec 2003 13:59:06 -0500
>From: Clif Jones <ctjones at earthlink.net>
>To: asterisk users <asterisk-users at lists.digium.com>
>Subject: [Asterisk-Users] G729 question
>Reply-To: asterisk-users at lists.digium.com
>
>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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