asterisk users - Mar 2007 - Asterisk SIP to MAX TNT Gateway, Sporadic Echo

Hi All,

I'm trying to track down an intermittent echo issue.  My setup is
<phone>sip<asterisk>sip<tnt>pri to carrier
less than 10ms latency on the network, 100% SIP, ULAW

I have several different phones; cisco, linksys, polycom, snom.  It's
difficult for me to reproduce the problem regularly so I'm really
having trouble isolating anything.  I'm wondering if this could be a
bad DSP on the TNT, and how would I isolate.  We have 600+ DSP's in
this chassis.

Any experience or ideas with this type of issue would greatly be appreciated.

Thanks.

JR

-- 
JR Richardson
Engineering for the Masses