I'm using Asterisk 1.0.9, a Digium TE210P dual T1 card, and two Rhino channel banks (one 12FXO/12FXS, the other 24 FXS). So it's an analog phone on the inside connected to one of the FXS ports, and PSTN line connected to one of the FXO ports.
My problem is that as soon as I hear the _first_ ring when I dial out through the PSTN line, I hear a tiny echo on the phone (I estimate between 20ms and 40ms), which never goes away for this call. It's just loud enough to bug the heck out of me when I'm talking (I could estimate the gain relationship with ztmonitor if it would help). The sound on the recipient end of the connection is perfect. If I make a call from the phone to the another internal extension (another phone on an FXS port), there is no echo. If I call into Comedian mail, there is no echo. I've checked all my gains. The "internal" gains were a bit loud to start with because of the powered phones, but now they all fall comfortably within ztmonitor's dynamic range display. The PSTN line is pretty good at tx 0 and rx 0, so I left it. I've tried turning them down, but that didn't kill the echo. My zapata.conf includes these lines at the bottom: echocancel=yes echocancelwhenbridged=no echotraining=yes context=companyA-pstn txgain=0.0 rxgain=0.0 signalling=fxs_ks group=1 channel=1-7 context=companyB-pstn txgain=0.0 rxgain=0.0 signalling=fxs_ks group=2 channel=11-12 context=internal txgain=-12.0 rxgain=-8.0 signalling=fxo_ls callerid=asreceived group=3 channel=13-48 When the calls are connected, I can use "zap show channel 11" and verify that the echo cancellation is ON. But I can still hear one. I've also tried echocancelwhenbridged=yes, but it didn't make any difference. -- Shaw Terwilliger <[EMAIL PROTECTED]> SourceGear LLC
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