Read the faq, checked the config files... can't find anything about an echo problem like this. Here's what I've got:
4 channel t1 card, span 2 going to channel bank with both fxs and fxo lines
Polycom IP600 phones on same LAN with asterisk
iax connection to voicepulse (T1 going out on another router)
Asterisk on a 2.4GHz machine
what I hear:
FXO <-> FXS no echo at all
FXO or FXS <-> voicepulse no echo at all
IP600 <-> voicepulse no echo at all
IP600 <-> FXO or FXS echo heard by IP600 caller, no echo heard by remote party
IP600 <-> IP600 can't get it to work yet - SIP times out (separate issue I guess)
I also did a few more tests:
- I made an extension that just does Wait(). Called it from the ip600. No echo.
- Used the built in Echo function. I only hear one echo. I measured the latency by recording it with a microphone. It is 100ms, which seems a bit excessive for ethernet.
The fact that I hear only one echo when doing the Echo test, and no echo anywhere except in the IP600 <-> POTS path, would lead me to believe that the source of the echo is within asterisk (not in transmission or in the phones), and only when bridging SIP<->POTS. Any ideas?
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