You log into the System Administrator's mailbox, press 9, and follow the prompts from there.
Chk Msg's
9997#
password-#
9
password-#
4(mailboxes)
4(create mailbox)
mailbox number-#(The mailbox number matches the Extension Number)
10-#(Class of Service)
0-9(Name)
*#(Approve)
You will hear "Nothing to Approve", but that is in regard to the spoken name, which I leave to the user to record in their own voice.
Additionally, you need to tell the Legend to send unanswered calls to voice mail
Menu
System Program
Exit
Extensions
More
Group Coverage
30 (may be any group from 1 to 30, but 30 is most common)
Enter
Extension Number
Enter