AT&T MERLIN LEGEND Release 2.0 Analog Direct-Line Console Operator's Manual page 82

Features
on. Also, if an inside Auto Dial button has been programmed,
the red light next to that button is turned on when an operator
has sent that extension a message.
If your DSS is set up with additional extensions on separate
DSS pages, you must press the appropriate Shift button to
see the message status of these extensions.
You can also check message status if you have Auto Dial
buttons programmed with co-workers' extensions. If the red
light next to the Auto Dial button is on, the co-worker's
message light is on.
To Program a Send/Remove Message
Button
1. Label the button to be programmed as Send/Remove
Message.
2. Slide the T/P switch to the P position.
3. Press the button you labeled Send/Remove Message.
4. Dial *38.
5. Slide the T/P switch to the center position.
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Messaging