AT&T Classic Mail Voice Messaging System - Manual (Page 27)

The CLASSIC MAIL system allows you to turn this feature
off or on, and to set the time interval between alert
attempts. You must have your telephone’s Intercom Voice
Announcement feature turned on in order to make this
feature work.
To turn message waiting alert off/on:
1.
2.
3.
4.
Open your mailbox.
A status message plays.
To change your mailbox options press
To setup message waiting alert press
To turn message waiting alert off/on press
3
5
1
To change the message waiting alert interval:
1. Open your mailbox.
A status message plays.
CLASSIC MAIL System Mailbox User Guide