asterisk users - May 2005 - Echo with two IP phones through Asterisk using SIP

I have Asterisk running on my LAN with softphone clients (SJPhone) and Cisco
7940/60s, all using SIP.  I also have a few remote sites connecting to my
Asterisk server.  I am getting an echo back of my voice when talking with
one particular site.  The caller does not hear an echo on their end.  All
calls on the LAN or to other sites do not produce an echo.  When the caller
places his SJPhone on mute there is no echo.  The caller is using a standard
PC headset and not a speakerphone.  I've tried turning on echocancel and
echotraining in the Zapata configuration, but it had no effect.  
 
The website below states that  two IP phones going through Asterisk should
not result in a noticeable echo, instead this is more common when connecting
to PSTN lines. The echo is about 500ms, faint but distracting.  Any
suggestions would be greatly appreciated.
 
http://www.voip-info.org/wiki-Asterisk+Echo+Avoidance
 
Thanks!
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One component of the echo that you are hearing is likely caused by poor
acoustic isolation in the headset of "the caller" that you described. 
It
might be eliminated by having "the caller" adjust their mic levels
down
slightly.  Better quality headsets usually have better acoustic isolation
properties too.


-----Original Message-----
From: Davin O'Neill
Sent: Thu, May 26, 2005 8:49 am

I have Asterisk running on my LAN with softphone clients (SJPhone)
and
> Cisco
7940/60s, all using SIP.  I also have a few remote sites connecting to my
Asterisk server.  I am getting an echo back of my voice when talking with
one particular site.  The caller does not hear an echo on their end.  All
calls on the LAN or to other sites do not produce an echo.  When
the
> caller
places his SJPhone on mute there is no echo.  The caller is using
a
> standard
PC headset and not a speakerphone.  I've tried turning on echocancel and
echotraining in the Zapata configuration, but it had no effect.

The website below states that  two IP phones going through Asterisk should
not result in a noticeable echo, instead this is more common
when
> connecting
to PSTN lines. The echo is about 500ms, faint but distracting.  Any
suggestions would be greatly appreciated.

http://www.voip-info.org/wiki-Asterisk+Echo+Avoidance

Thanks!
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