[Freeswitch-users] Problem on some of of the calls (not calling / no Hangupcompleted event / Not released)

Hi there, For testing purpose, I have my freeswitch calling itself. Once in awhile, I have originated a call, but calls don't seem to go through / or get "stuck". I have code that would create record the whole session, and also report the call status by subscribing the HangupCompleted event--None of these happens. Also when I check the status, the session was not released/destroyed while most of the calls went through OK. Could someone please tell me what might go wrong and how to fix this? My freeswitch is downloaded on 7/27/2011. Thanks, Frankie