Well I'll take this and see if I can't talk them into letting me take the Mitel Training so we can finally get this thing properly mapped out.
Because I don't understand it myself. :D I don't understand this system and it was set up years ago with no one leaving behind information on how it was setup.
I think I can just leave it here then but just in case let me see if I can't describe what I'm seeing.
The Auto-Attendant has 6 options.
Under the Voice Mail configuration form I see six single digit voicemail boxes 1-6 each set to Transfer Only.
Two of these "Transfer Only" mailboxes point to extensions that only exist inside of the Voicemail Configuration and Call Rerouting Assignment forms. No other reference to these is available.
So I assumed the only thing they were doing was setting up a voicemail box and giving it an extension. But from what I understand, from what you and the person before you said, it relies on a phone that is currently in use having a special key setup for it.
None of the phones in the offices that ring when these extensions are dialed (they have WMI, Busy Lamp, and Multicall for this extension) or when the proper key is pushed at the Auto-Attendant have any Single Line key set up at all.
So I will have to do a manual check of all of the rest of the phones to see if they haven't moved a phone at one point that was originally in one of these offices.
Again, thank you for your time. It's obviously something I don't want to touch until I've managed to get the training.