I didn't talk to Joe but one of my co-workers did and he doesn't know what would cause it. I was sent in today to get a set of fresh eyes on the trouble.
Thats funny you say that because the receptionist also complains about intermittent incomplete calls. She will dial a number and wait forever, then finally the line will drop. She tries again and it goes through. Don't know....
Really though, on second thought. That wouldn't effect intercom calls and transferring to VM.

Thanks Mars!