AT&T MERLIN LEGEND System Reference Manual page 360

Features
Telephone Differences
Multiline Telephones
Single-Line Telephones
Considerations
Reminder Service cannot be used on a queued call console (QCC).
A multiline telephone user arranges Reminder Service for his or her own
telephone by pressing a programmed Reminder Set button or pressing the
Feature button and dialing 81, and then dialing a 4-digit time (0100 to 1259) and
either 2 for a.m. or 7 for p.m. To cancel a reminder, the user presses a
programmed Reminder Cancel button or presses the Feature button and dials
*81.
A system operator with a DLC arranges Reminder Service for another telephone
by pressing a programmed Reminder Set button or pressing the Feature button
and dialing 81, then dialing the extension to be called, using the dialpad or an
Auto Dial or DSS button, and then dialing a 4-digit time (0100 to 1259) and
either 2 for a.m. or 7 for p.m. To cancel a reminder for another telephone or a
missed reminder, the system operator presses a programmed Reminder Cancel
button or presses the Feature button and dials *81, and then dials the
extension, either using the dialpad, an Auto Dial button, or a DSS button.
A single-line telephone user arranges Reminder Service for his or her own
telephone by lifting the handset (must be listening to internal dial tone), dialing
#81, and then dialing a 4-digit time (0100 to 1259) and either 2 for a.m. or 7 for
p.m. To cancel a reminder, the user lifts the handset (must be listening to
internal dial tone) and dials #*81.
Reminder Service cannot be used on a QCC.
Missed Reminder buttons can only be programmed on system operator
display consoles because the display is needed to show which reminder was
missed.
Reminder Set cannot be used to set a reminder time when the green LED
next to the Missed Reminder button is steadily on, indicating that the system
operator can read missed reminder messages.
Only one reminder can be set for a telephone at a time.
Reminder Service does not have to be reset each time it is used; reminders
carry over to the next day.
Missed reminders can be canceled only by a system operator.
The system time must be set to use Reminder Service.
Reminder Service uses system time, which can differ from the time set by the
user with an analog multiline display telephone.
If a time for a reminder was previously set, it is not shown on display
telephones when the Reminder Service button is pressed.
Reminder calls may ring up to three minutes before or after the set time.
Reminder Service 2-311