asterisk users - May 2005 - PSTN->voip/sip echo

I'm still relatively a novice with asterisk and am having issues with echo.
The calling party that calls a PSTN number doesnt hear the echo, but the 
answered
side via sip or forwarded to another PSTN number over voip hears 
excessive echo that
makes it difficult to communicate.

I've been playing with the zapata.conf settings for echocancel, 
echotraining, rxgain, txgain, etc
and am basically stabbing in the dark (grin)  I've read the wiki about 
it, but it doesn't go into very
much detail.

Anyone know which parameters fix this issue?
Is there an easier way than tweaking settings in zapata.conf, monitoring 
with ztmonitor, and restarting asterisk over and over?

JD

JD wrote:
> I'm still relatively a novice with asterisk and am having issues with 
> echo.
> The calling party that calls a PSTN number doesnt hear the echo, but 
> the answered
> side via sip or forwarded to another PSTN number over voip hears 
> excessive echo that
> makes it difficult to communicate.
>
> I've been playing with the zapata.conf settings for echocancel, 
> echotraining, rxgain, txgain, etc
> and am basically stabbing in the dark (grin)  I've read the wiki about 
> it, but it doesn't go into very
> much detail.
>
> Anyone know which parameters fix this issue?
> Is there an easier way than tweaking settings in zapata.conf, 
> monitoring with ztmonitor, and restarting asterisk over and over?
>
> JD
>
I should add that it's only on calls that are bridged.  Calls inbound to 
PSTN don't hear echo, sip/iax in/calls out don't hear echo but when 
they're bridged (inbound PSTN outbound VOIP) the called party hears echo 
badly.
What can I do about it?

JD

-- 
JD Austin
Twin Geckos Technology Services LLC
email: jd@twingeckos.com
http://www.twingeckos.com
phone/fax: 480.288.8195