asterisk users - Sep 2003 - Busy detect and Hangup with VoiceMail Problem

Hi:

  I have the next problem at VoiceMail application, when i call is 
recive, it does not detect when the user hangup the call..

  The first solution i think was to place the busydetect=yes at 
zapata.conf  but it cause that some calls get lost ( when some one is 
talking, the * hangup the call)...

  So i limit VoiceMail for 2 minutes each messages, it resolve the 
problem in a first moment, but i have the problem, that if some user who 
is chechink its mailbox from outside, and hangup the program does not 
detect it.

  In resume, my VoiceMail application does not detect when some one 
HangUp and if I use busydetect at zapata.conf it hangup active calls.

   Any suggestions??