Alright, so it gets weirder.
One user has a blinking message waiting light, when I log into her mailbox, there are no messages yet the light is still blinking. When she presses the messsage waiting indicator instead of dialing our voicemail pilot, it dials the extension of another user in our system.
The user whos extension her button dials also is prompted to dial her extension when he presses his message waiting button. Any ideas?