asterisk users - May 2008 - Lucent Max TNT PRI Agg --> * --> SIP DEV (PHONE or ATA) Excessive Echo (only to the sip party)

Hello...
We're attempting to track down an intermittent echo issue.  Our setup is
<phone>sip<asterisk>sip<tnt>pri to carriers.  We have less
than 2 ms latency on the networks (FTTx), totally SIP w/ G711u.  The party
hearing the echo is the subscriber using sip.  The PSTN users does not hear the
echo.

We should be note that there is zero echo when calling sip to sip with or
without reinvites enabled.

We have several different phones; linksys, polycom, & grandstream (both atas
and phones).  It's difficult to reproduce the problem regularly so isolation
is an issue.


Thanks in advance..
-Joe

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I've found an interesting link.  It might help you out.

http://www.cisco.com/en/US/docs/ios/solutions_docs/voip_solutions/EA_ISD.html

Peter

Joe Carroll wrote:
> Hello...
> We're attempting to track down an intermittent echo issue.  Our setup
is
> <phone>sip<asterisk>sip<tnt>pri to carriers.  We have
less than 2 ms latency on the networks (FTTx), totally SIP w/ G711u.  The party
hearing the echo is the subscriber using sip.  The PSTN users does not hear the
echo.
> 
> We should be note that there is zero echo when calling sip to sip with or
without reinvites enabled.
> 
> We have several different phones; linksys, polycom, & grandstream (both
atas and phones).  It's difficult to reproduce the problem regularly so
isolation is an issue.
> 
> 
> Thanks in advance..
> -Joe
> 
> 
> 
> 
> ------------------------------------------------------------------------
> 
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