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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