I have an IPO that's driving me nuts.
One station 6241 is changing itself to 6239 for no apparent reason.
I looked at the extension and it has the appropriate shelf and port assigned to it. User looks right in the translations but the guy has 6239 show up on his phone and calls are routing to his voice mail.
6239 has no phone associated with it, but if I remember right it does have an old user assigned to it.
I rebooted the system and it seemed to fix the problem until I got out the door and then went back to the wrong display.