AT&T MERLIN LEGEND System Reference Manual page 208

Features
Do Not Disturb
Extension Programming
Description
Telephone Differences
Queued Call Console
All Other Multiline
Telephones
Single-Line Telephones
Programming Code:
MLX Display Label:
Do Not Disturb prevents calls from ringing and prevents paging over a user's
speakerphone. When the feature is activated and the user receives an outside
call, the caller hears ringback, but the telephone does not ring. The green LED
next to the line button with the ringing call flashes to indicate an incoming call,
and, if the user chooses, the call can be answered. If the feature is activated
and the user receives an inside call, the inside caller hears a busy signal. The
user's telephone does not ring, and the green LED next to an Intercom or
System Access button does not flash.
When Do Not Disturb is activated, the telephone rings and the green LED next
to the button flashes for the following priority calls:
A call from a receiver with a Primary Cover or Secondary button programmed
for the user
A call from another person using the Barge-In feature to alert the user to
emergencies or other urgent situations
A returning transferred, camped-on, or parked (DLC only) call
A Callback call that notifies the user who activated the Callback feature that
a call to a busy extension or to a busy pool (Hybrid/PBX only) can be
completed
Do Not Disturb cannot be used on a QCC.
All other multiline telephone users activate Do Not Disturb by pressing the
programmed Do Not Disturb button. The green LED next to the button goes on
to indicate the feature is active. To deactivate the feature, the user presses the
programmed Do Not Disturb button again. The green LED next to the button
goes off to indicate the feature is deactivated.
Feature codes cannot be used to activate and deactivate Do Not Disturb. An
MLX telephone user can select the feature from the display only during
programming.
Users at single-line telephones cannot use Do Not Disturb.
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DoNotDisturb [DND]
Do Not Disturb 2-159