[Asterisk-Users] one way / irratic voice over iax and g729

[Michael J. Liberatore]

So you have 2 asterisk systems connected, I am doing this for the first
time.  Any tips you can give me besides whats on the wiki?  I am not
sure the best way to set it up, I want to be able to have the 2
locations act as 1 over their internet connection to each other, I was
planning to use vpn...

Mike
 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Ben
Dinnerville
Sent: Friday, February 17, 2006 4:03 AM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] one way / irratic voice over iax and g729

Hi All,

We are experiencing a a problem when running calls over IAX with g.729. 
The call flow is as follows:

Sip handset -(SIP)> Asterisk1 -(IAX)> Asterisk2 -(SIP)> Carrier

The first Asterisk system is running 1.2 and the second is running 1.0. 
When using g726 from the handset all the way thru to Asterisk2(then 729
for the carrier leg) calls go thru fine, but when using g729, there is
one way voice whereby the B party cannot hear the A party, however the A
party can hear the B party  fine. Sometimes there is no audio for the B
party, other times the B party can hear the A party but it is very
broken up and stuttery, with only parts of the words coming through. The
calls also work fine when using g711 from the A party.

Asterisk2 is running a couple of TDM04B's so there is a physical timing
device on that side and Asterisk1 is running ztdummy on a 2.6 kernel -
so there is timing on that side also (??)

Have done a fair bit of searching on this one, and as it only happens
with g729 (both systems have the licensed codecs installed) it is a bit
of a head scratcher - has anyone else experiencved this? Or does anyone
have any feedback?

Cheers,

Ben

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