i am using asterisk (tribox linux) 2.6.9. using rihno, and digium t110p card on asterisk and having 10 hardware ip phones 5 soft phone. i am getting echo while calling to outside (PSTN), while within network (sip) there isn't any echo.

zapata.conf


echocancel=yes
echocancelwhenbridged=yes
echotraining=5555
rxgain=100%
txgain=-100%

checked every posibility txgain. e.g
txgain=10%
txgain=-10%
txgain=-90%
txgain=-50

can any have idea regarding this

thanks

First, update Zaptel. Trixbox ships with stale Zaptel drivers that often do not support newer hardware or include the latest improvements in echo cancellation. It's a pain, in part because Trixbox doesn't come with kernel headers, either. And then there's the chronic spinlock.h problem that Trixbox hasn't fixed in release after release... have you tried AsteriskNOW.org? It's genuine Asterisk, distributed by Digium.

To eliminate the echo, check the following helpful knowledgebase articles:

http://kb.digium.com/entry/19/1/
http://kb.digium.com/entry/19/134/

With the suggestions in these articles, you should be able to put your gain settings back to normal and resolve echo trouble.

Hope this helps,
rm

In addition to the built in option in Asterisk for echo removal, and specifically in case the origin of the echo is a far-end system (i.e. the echo tail is long), you might want to consider the PBXMate from SoliCall.