I have seen Voicemail pro fail multiple times as people have restarted the server due to 'windows' updates however when the Server restarts it will also apply any updates for firewalls and anti virus software and these are notorious in blocking ports...
I hate Mcafee nuff said!
Avaya, Alcatel, Panasonic, 3com NBX, Swyx, 3cx
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Avaya ACIS SME
Alcatel ACFE
Jack of all, Master of none!