I have one user who gets sent to the incorrect voicemail box when he hits his Message button, this apparently happened within the past day. I do not see anything amiss in his setup. His associated extensions are correct, the listed mailbox for his extension is correct, keymaps look correct, even the display on his phone is correct - it said he had four messages, which he was able to retrieve when directly connecting to the voicemail extension and logging in manually. The user whose mailbox his button attached to did not have any waiting messages at the time. Essentially he's seeing that he has messages, hits the VM button on his phone, and gets sent to a secretary's mailbox instead.
Any idea where I should look? My first thought is a reboot of the phone system, after that I am considering recreating the mailboxes of both individuals and see if that resolves the situation.