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

[Peter]

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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