I would like to help you but you are in way over your head. The Kyys is used for Automatic Call Distribution, not voicemail.

The incomming vm calls usually go to mailbox 990 and then chain to mailbox 991 and then someone makes a selection.

Can you get into mailboxes 990 and 991?

I don't understand about line three. Are you talking about the voicemail using line three to page someone or for a person to call out?

In program 81 andd 87 you are setting which group or which station in a voice hunt group will ring in day or night mode.

This is one where it would be productive to bring in a tech and have them work on your system.

If you can tell us what cards are in the ksu in order from left to right and how many lines and extensions you have, I can get you started at least.

THE Bracha, old blond specialist in Rube Goldberg solutions.