AT&T MERLIN LEGEND System Reference Manual page 210

Features
Forward and Follow Me
Group Calling
Headset Options
Multi-Function Module
Paging
Queued Call Console
Reminder Service
Signaling
System Access
Transfer
Voice Announce to Busy
Related Features
Calls are not fowarded to a user who has Do Not Disturb active; the call rings at
the forwarding telephone. Activating Do Not Disturb at the forwarding telephone
does not prevent calls from being forwarded.
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 since the device connected to the
MFM does not have an LED to indicate when the feature is active.
Speakerphone paging calls cannot be made to a telephone with the Do Not
Disturb feature activated.
Do Not Disturb cannot be used on a QCC; Position Busy must be used instead.
The green LED next to a DSS button goes on when a user activates Do Not
Disturb to indicate that the user is not available.
Reminder calls ring at telephones with Do Not Disturb activated.
Signaling cannot be used when the destination telephone user activates Do Not
Disturb.
Do Not Disturb prevents ringing of incoming calls at Intercom or System Access
buttons (including Shared System
feature is activated. In the Hybrid/PBX
on the principal's System Access button from ringing at other telephones with
Shared System Access buttons.
Calls transferred to telephones that have Do Not Disturb activated are returned
after the Transfer Return Interval expires unless the telephone has a Call
Coverage arrangement and a receiver is available. In that case, the transferred
call is redirected to the receivers like any other call.
A user with Do Not Disturb active does not receive voice announcements.
Coverage On/Off
Queued Call Console-Position Busy
buttons) on the telephone where the
Access
also prevents calls received
mode, this
Do Not Disturb 2-161