I'm trying to fix an Iwatsu SX.
The night greeting says press 5 to leave an emergency number. (what is that voicemail number?) I tried logging in, but it needs a passcode. I can't even find out what the number of that box is so I can delete the passcode for it.

Also, form the previous owner, I understand that anytime a voicemail was left on that box, it used to call an external number with a notification. But that is no longer working. What do I need to do to get that working again?

Any help is greatly appreciated!!!