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

[Ben Dinnerville]

Hi All,


An update for this problem. The problem seems to lie with the fact that 
1 Asterisk system was a 1.0 release (1.0.10) and the other was a 1.2 
release (1.2.4) - there seems to be some computability issues with the 
IAX implementations for certain codecs here. We setup another server 
with 1.2.4 on it and the A party was also running 1.2.4 and calls will 
now go through without a problem so all is now sorted.


Cheers,

Ben

Ben Dinnerville wrote:
> 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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