AT&T MERLIN LEGEND Release 4.0 Feature Reference page 236

Feature Reference
Forward and
Follow Me
Group Calling
Headset Options
Multi-Function
Module
Paging
Posted Message
Reminder Service
Signaling
System
Access/Intercom
Buttons
236
Do Not Disturb
Calls are not forwarded to a destination extension that has Do Not
Disturb turned on; the call rings only at the forwarding telephone as
described in Table 20. Turning on Do Not Disturb at the forwarding
extension does not prevent the calls from being forwarded.
In Release 4.0, turning on Do Not Disturb at a forwarding extension
causes calls to be forwarded immediately. The Forwarding Delay does
not have an effect.
If a calling group member uses Do Not Disturb, calls are not sent to the
group member even if he or she is logged in and available.
If an MLX telephone user with Headset Auto Answer uses Do Not
Disturb, any calls that override Do Not Disturb (such as Barge-In calls
and callback calls) are automatically answered.
Using Do Not Disturb is not recommended because the device
connected to the MFM does not have an LED to indicate when the
feature is active.
Group page calls cannot be made to a telephone with Do Not Disturb
turned on.
In Release 2.0 and later, when Do Not Disturb is turned on, the system
automatically posts
Home screen of an MLX display telephone user with Do Not Disturb
turned on. It also appears on the screen of any inside caller with a
display telephone who calls a user with the feature turned on. The
system automatically removes the message when the user turns off the
feature.
Users with analog multiline or MLX-10 nondisplay telephones must
program a Posted Messages button for the system to automatically post
or remove the message when the feature is turned on or off. A user can
post or remove a Do Not Disturb message by pressing a programmed
Posted Messages button.
Posting the
removing the posted message does not turn the feature off.
Reminder calls ring at telephones with Do Not Disturb turned on.
Signaling cannot be used when the destination telephone user turns on
Do Not Disturb.
Do Not Disturb prevents ringing of incoming calls at SA or ICOM
buttons (including Shared SA buttons) on the telephone where the
feature is turned on. This also prevents calls received on the principal's
SA buttons from ringing at other telephones with Shared SA buttons for
that extension.
. This message appears on the
message does not turn the feature on;