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

[Joe Carroll]

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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