asterisk users - Mar 2006 - Problem with chan_iax.c implimentation causesbadaudio?

We upgraded all five servers to 1.2.4.  We tried trunking/notrunking.  

End users use an IAX2 softphone on their desktop PCs.  Agents are VLANed
and all IAX2 traffic is QoS'd on all LAN and WAN legs.  Calls flow from
the agents to the local Asterisk server as IAX2/ulaw.  Then they went
over the IP-VPN as IAX2/g729 (we tried ilbc and straight ulaw as well).
Calls get to the PSTN from the central site via PRI on TE410P cards.

Point is that it worked fine for 6-9 months before the Asterisk 1.2.4
upgrade.



-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Andrew
Kohlsmith
Sent: Tuesday, March 21, 2006 10:21 AM
To: asterisk-users@lists.digium.com
Subject: Re: [Asterisk-Users] Problem with chan_iax.c implimentation
causesbadaudio?

On Tuesday 21 March 2006 09:47, Adam Robins wrote:
> We have three remote call center Asterisk servers communicating with 
> two central Asterisk boxes over a private IP-VPN with QoS.  All 
> systems were running Asterisk 1.0.7 communicating via IAX2 with little
> or no quality issues at all.
>
> Once we upgraded to Asterisk 1.2.4 call quality with IAX2 was
horrific.
> We tried with/without jitterbuffer.  We messed with every jitterbuffer
> parameter.  We tried G729/ilbc/ulaw.  It was a total mess.
Did you upgrade all three boxes?  Did you try disabling trunking?  What
was your "last mile" solution?  (i.e. what did the end-users speak
into,
and how did their calls get to the PSTN?)  If it was to a far-end
Asterisk box, what version where they running?  Were you communicating
using IAX2 to them too?  
Did they upgrade to 1.2.4 as well?

I am running SVN trunk with IAX2 and SIP and have *zero* issues.

-A.
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On Tuesday 21 March 2006 10:55, Adam Robins wrote:
> End users use an IAX2 softphone on their desktop PCs.  Agents are VLANed
If there were significant changes to chan_iax2 and these were not upgraded to 
match, this could explain the trouble.
> Point is that it worked fine for 6-9 months before the Asterisk 1.2.4
> upgrade.
Oh, I understand the point.  I'm not defending a protocol change causing
such
breakage, I am just trying to identify why the breakage occurred when 
Asterisk was upgraded.

Out of curiosity, which softphones do you use?  What kind of interface to the 
user, just a cheap headset plugged into the speaker/mic on a soundcard (which 
soundcard? I've had trouble with some) or something fancier such as a 
Plantronics USB headset or bluetooth one?

Regards,
Andrew