I was running 3CX v5 and noticed that v7 was already out so I decided to upgrade. Not the easiest path in the world, but I managed to get everything working after an hour or so with one exception. Anytime I get an external phone call the phone does a half ring and sends the call to voicemail. I tried to restart the services, and reboot the server. This would provide a temporary solution and things would work fine, but after a few minutes it goes back to sending calls to any extention to voicemail. Any idea what could be causing this problem?