I suddenly have two phones where users are unable to access their voicemail by hitting the VM button. Instead, the VM button dials another user's extension.

On the screen, it says "Call 5991-5940V" where the first number is user one's extension, and the second number is the extension called if user one hits his VM button.

I've been looking at campon and automatic call back, but neither seems quite the same - but I'm not very familiar with either one. Trying to figure out what's going on, how it happened, and how I prevent it from happening in the future. Any and all suggestions are deeply appreciated.

Here's pic of the screen

[Linked Image from i.imgur.com]