AT&T MERLIN LEGEND Release 2.0 Analog Direct-Line Console Operator's Manual page 31

About Your Direct-Line Console
Understanding DSS Button Lights
Each DSS button has an associated green light. This light
provides the following information.
Light
Off
On
Fast Flashing
Slow Flashing
NOTE:
The Message Status light must be off when you check this
information.
Using Message Status Lights
When the light next to the Message Status button is blinking,
the green light next to the DSS button shows message status;
if the DSS button light is on, your co-worker has an operator
message waiting.
The red light next to an Auto Dial button programmed with a
co-worker's extension also shows message status: when the
light is on, your co-worker has an operator message waiting.
Lights
1-20
Meaning
This co-worker is not on the telephone and does not have
Do Not Disturb (DND) activated. (For information about Do
Not Disturb, see the Analog Multiline Telephones User's
Guide.)
This co-worker is on the telephone or has DND activated.
This co-worker is calling you.
A call you transferred to this extension is returning to you.