[Asterisk-Users] dropped calls when g729 is used on sip leg

[Mojo with Horan & Company, LLC]

I don't know what to look for in my sip debug logs, can anybody suggest 
what sorts of messages my phones might unexpectedly give asterisk 
causing it to drop the zap leg?

Mojo with Horan & Company, LLC wrote:
> Hello - I have 8 polycom 501s all setup great using ulaw.  We have put 
> them through a pretty rigorous torture over the last 4 months, and 
> they've performed famously.  No dropped calls ever.
> 
> We invested in some g729 licenses.  changed my ipmid.cfg so that g729 is 
> priority 1 and ulaw is priority 2.  I added allow=g729 to my extension's 
> sip.conf entry, where existed before disallow=all and allow=ulaw.
> 
> told asterisk to do a reload, and tried dialing out on a zap line.  It 
> was obvious from the call quality that g729 had been selected, and I 
> double-checked and triple-checked by
> 1) a sip show peer 112 shows:
>    Codecs       : 0x104 (ulaw|g729)
>    Codec Order  : (g729,ulaw)
> 
> and 2) the status of the current call as reported by the phone's menu 
> system  shows it using g729 as well.
> 
> So, great.  lower network usage, and the quality is good.  And if I call 
> another polycom configured the same way, they drop asterisk per 
> canreinvite=yes, and continue their happy g729 way.
> 
> After an indeterminate amount of time, sometimes 30 seconds and 
> sometimes 5 minutes, one of two things happens: first, sometimes, the 
> zap leg just disappears.  I don't get any messages on the CLI at verbose 
> level 30 and debug level 30.  The SIP leg stays connected, but the audio 
> trails out into a lovely mash of codec ether before silence.  The phone 
> remains off-hook when this happens, and it just remains silent.  So I 
> didn't think sip debug logs would help, but I will post them if someone 
> thinks it might help.  Secondly, sometimes, the zap leg doesn't 
> disappear, but audio is not delivered from the g729-using polycoms to 
> the zap callee.  I hear them but they are just hello?  hello?.  Neither 
> of these things happen when the phones runs in ulaw.
> 
> Does anyone have any idea where to look? I'll post whatever logs anyone 
> thinks might help.
> 
> I'm using 1.2.0b1, but this occurred with my CVS HEAD of around 
> 7/20/2005 as well.
> 
> Thanks!
> 
> Mojo
> 
> 
> 

-- 
Mojo <mojo at horanappraisals.com>
Office Manger, Horan & Company, LLC
(907) 747-6666 x112