i am getting lot of echo in the Meetme(With out digium hardware) conferance.I tried setting echocancel=yes,"echocancelwhenbridged=yes"
and “echotraining=yes” in zapata.conf but it does not solve my problem.
I am using ztdummy instead of digium hardware and my kernel version is 2.6.Is there any way i can solve this.
Dont use meetme 
. This is a common problem with meetme and ztdummy.