asterisk users - Aug 2006 - Echo cancell

hi all i have a newbrand phone Linksys spa941 and i realize that my
asterisk have ECHO. :(

in the zaptel file i have this parameters

echocancel=128 
echocancel=yes 
echocancelwhenbridged=yes
echotraining=yes


i need to add any other parameter to cancel the echo?

thanks. any tips?

Switch your echo canceller to MG2. Look for zconfig.h in zaptel and
recompile. Also experiment with echocanel=256 and adjust rxgain/txgain.