[asterisk-users] RE: ECHO Cancellation in SIP Calls

[Michael Araba]

I am surprised that you are getting echo on SIP calls. You can get echo
in two scenarios on SIP calls.

1. If SIP calls are crossing to PSTN (inbound/outbound). Here you need
to enable echo canceller and AGGRESSIVE if needed in zconfig.h. 

2. Second source of echo on SIP calls could be ACOUSTIC. The phone sets
you are using may not handle this well. 

In my experience sound quality deteriorates if there is network trouble
or congestion on SIP calls

I hope this helps.

Michael