I had 4 digital ports that I wanted to set up as phantoms so user's DID calls would still get VM notifying callers they changed office locations to another city. I initialized ports and then unplugged phones. Then i called from outside line to test and calls went to that ext's VM box on first couple of test calls but after 4th call it would RNA. Then i call from internal ext and get not in service. How come ports won't stay active unless phone is plugged in? Set relocate was OFF. Is it a software version issue?