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 ?
The snom phones are pretty decent devices and shouldn't introduce echo.
Your latency might be too high between asterisk + voipprovider
introducing a delay that is noticed as echo.
You are hearing the echo that is introduced on the callers side.
As I understand it, when you are calling someone there is no zap
involved and thus you can't cancel it with zapata.conf.
if you look at voip-info.org [1] you'll find a good explanation why you
can't use an echo canceller to cancel that sort of echo.
So, check the path between you and the voipprovider, e.g. connection
saturation, ping times etc
(This is assuming you have a proper lan connection between
asterisk/snom)
Conrad
[1] http://www.voip-info.org/wiki/index.php?page=Asterisk+Echo
+Cancellation
Hi Conrad,
thanks for your help, this is the way i understand it all the time, a
year ago i have optimized my Business Lan for VoIP and there is no loss
or lag anymore, the Provider seems to be okay, i have pinged him for one
day with MTR, no great loss or high ping.
Some days ago i have read a Thread about EC-Cancellation in SIP Calls
with the zapata.conf and never understood how this could work, thats the
beginning of my question ;)
In my case, there is no Zap, you are right. So i must start at the
beginning and search for a lag...
The EC started two or weeks ago after one year of great communication,
in this time i updated Asterisk from 1.2.10 to 1.2.12.1 and zaptel from
1.2.7 to 1.2.9 ...
I will watch the Quality and the latency next time....Thx for your time !
Stefan
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