jmr.richardson at gmai...
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 Posted: Thu May 08, 2008 5:17 pm Post subject: [asterisk-users] Lucent Max TNT PRI Agg --> * --> SIP |
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| Quote: | 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.
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I had intermittent echo when I first deployed TNT's as well. It took
a while to track down. Adjust the volume on the TNT lower until the
echo goes away. Here is what I had to set mine to:
In each T1 config:
set line-interface voip-gain-control input-pad = 3db-loss
set line-interface voip-gain-control output-pad = 3db-loss
Hope this helps.
JR
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JR Richardson
Engineering for the Masses |
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