Okay, I'm stumped. When I call the PSTN (through POTS lines), my analog phone phone works fine. My SIP phones -- a Grandstream and a Polycom -- have major echo; roughly a .25 second delay. Eventually, it goes away, which I guess is echo cancellation in action. But, dammit, why does my analog phone work fine? I've tried myriad CODECs, and various echo cancellation settings, to no avail. Can anyone give me an idea of what I should be checking? [Note that internal calls work fine.] Thanks, -Ken
timebandit001@gmail.com
2005-Jan-18 04:46 UTC
[Asterisk-Users] Echo on SIP -- not on analog.
Echo will only happen when you go from digital to analog. Here is more info on this : http://www.voip-info.org/wiki-Asterisk+echo+cancellation http://www.voip-info.org/wiki-Asterisk+echo+analog+lines http://www.voip-info.org/wiki-Asterisk+Echo+Avoidance And remember : Google is your friend