We changed the windows time of the unity connection 1.2 server as a manual work around for a day lights saving time in AU.
This caused all voice mail ports from with in call manager 5.1 to unregister, thus preventing voice to stop working. I didn't see logs in the event viewer.
As soon as i put the time on the windows server forward an hour (which is the incorrect time) the ports in call manager registered fine, and VM worked.
Does anyone have any ideas?
Many Thanks :)
I believe I installed a day light savings patch from microsoft which corrected the time.
Hope this helps