AT&T MERLIN LEGEND Release 2.0 MLX Direct-Line Consoles Operator's Manual page 100

Features
light that was turned on by another operator by using the
Message Status button. To check the status of a co-worker's
message light, press the Message Status button. If the
green light next to that person's DSS button is on, then he or
she has an operator message and his or her message light is
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 Page 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.
When you send a message to an extension with an MLX
display telephone, it turns on the message light and-delivers
the message ATT OPERATR or your name, if programmed.
The message also shows the date and time and your
extension number.
When you send a message to an extension with an analog
multiline display telephone, it turns on the message light and
delivers the message Call OPERATR or your name, and
shows the date and time of the message.
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Messaging