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

[Martin Joseph]

On 2006-10-26 23:02:40 -0700, Stefan Agethen 
<stagethen at baeckereiagethen.de> said:

> 
>>> 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 !
>> 
>> 
>> Are you hearing the echo, or is the far end party?
>> 
>> 
> I can hear the Echo, the end party never got this problem.

If you can adjust the microphone gain on your local handset down, you 
may find that reduces audio coming back from the far ends mic (ie If 
you audio is very loud it could be bleeding across from the far end ear 
piece to the far end mic.

Worth a try anyhow...
Marty