AT&T MERLIN LEGEND Release 4.0 Feature Reference page 345

Feature Reference
A Send/Remove Message button is a fixed button on Queued Call Consoles
(QCCs) and cannot be reassigned. On a system with 29 or fewer lines,
Send/Remove Message is assigned by default to analog DLCs on button 34. On
a system with more than 29 lines, Send/Remove Message is replaced with line
32.
On QCCs and MLX DLCs with a DSS, as well as MERLIN II System Display
Consoles, the operator can use the LEDs next to the DSS buttons to determine
whether an operator turned the Message LED on. Before sending a message,
the operator presses the Message Status button and checks the red LED next
to the DSS button of the person to whom the message will be sent; the red LED
is on when a message is waiting from an operator and off if no message is
waiting from an operator. The LEDs on the DSS do not go on when Message
LEDs were turned on by using the Leave Message feature, voice messaging
system, fax arrival, or when a message is left for a calling group. To leave a
message-waiting indication when the LED is off, the operator presses the
programmed Send/Remove Message button, followed by the DSS button or
Auto Dial button for the person for whom the message is intended. The operator
presses the Message Status button to return to normal call handling. MLX DLC
operators can also press the Feature button and select the feature from the
display.
NOTE:
If the operator sends a message while on a call, only an inside caller hears the
touch tones; an outside caller does not.
When Message Status is on, if the LED next to a DSS button is on and the
operator uses the Send/Remove Message feature, the user's message LED is
turned off (unless the LED is also on for a reason other than an operator using
Send/Remove Message). When the LED next to a DSS button is off and the
operator uses the Send/Remove Message feature, the user's Message LED is
turned on.
A DLC operator without a DSS can check message status by using Auto Dial
buttons programmed with extension numbers. The red LED next to an Auto Dial
button indicates whether the Message LED is on. A QCC operator without a DSS
cannot check message status. If an operator who cannot check status sends a
message, that message can cancel a message-waiting indication sent by
another system operator who used Send/Remove Message.
Leave Message
The Leave Message feature allows any user (including operators) to send
messages to co-workers with display telephones.
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Messaging