[asterisk-users] ECHO Cancellation in SIP Calls

[Stefan Agethen]

Hi,

i am from Germany, so excuse my School English.

I use Asteriks 1.2.12.1, zaptel 1.2.9 and mISDN Rc25 - since my update 
of Asterisk 2 wooks ago, Echos accure in my SIP Calls.

I use SNOM 360, sometimes there is no echo (for example if i call myself 
via SIP->Asterisk->SIPProvider->TELEKOM->ISDN)
but if i call other people there occures Echo many times. The Routing is 
always the same :
SIP (SNOM) -> Asterisk -> VoIPProvider -> ISDN/POTS

Can i control the cancellation with the zapata.conf ?

I have tried this with "echocancel=..." and so on, no luck :(

I would be glad to get some help, the Docs of Asterisk dont explain how 
to cancel Echos in ! SIP !