asterisk users - Jun 2004 - asterisk server hang up after conference

Hi all,

I got to make the conference work by the help of  Jeremy and Philipp, thanks
guys.

Right now im having a problem again, my server hang up after a user exit on
a conversation in a conference.

unloading the modules ztdummy the server works very well. what should be the
problem, im using the cvs head of asterisk and zaptel.

thanks a lot.