Yo Guyz! I got some problem here with the ztdummy. It creates a lot of echo and delays in the Meetme conference. I searched for some help and i came upon this bugs.digium.com/view.php?id=4301.
They said i need to patch it, but i have no idea to patch which one and issit for stable version or the beta version or the cvs head version. 
btw i’m using asterisk and zaptel version 1.2.0 beta. Any ideas guyz?? Thankz!