AT&T MERLIN LEGEND System Reference Manual page 214

Features
Callback
Direct-Line Console
Direct Station Selection
Do Not Disturb
Group Calling
Queued Call Console
System Programming
Related Features
In the hotel/motel configuration, a station in ES state 1 or 2 cannot use Callback
to request busy pools.
Extension Status can be assigned to DLCs only. In the hotel configuration, only
a DLC system operator can change an extension to status 0. to the Group
Calling/CMS configuration, a calling group or CMS supervisor uses a DLC to
monitor and change group member status.
A calling group or CMS supervisor or a DLC console with Extension Status
assigned can change the status of a group member or room by pressing a
programmed Available or Unavailable Extension Status button and then
pressing the DSS button for the group member or room. See "Direct Station
Selector" in this chapter for a complete description of the use of a DSS adjunct
and the meaning of LEDs for Extension Status.
The LED next to an Auto Dial or DSS button is on when the user activates Do Not
Disturb or is busy on a call. The system operator cannot distinguish between the
two states.
Extension Status allows calling group supervisors to change and monitor calling
group member status and to enable group members to sign in and out of the
calling group.
Extension Status cannot be used on a QCC, and a QCC cannot be a calling
group or CMS supervisor console or a calling group member.
Designated either hotel or calling group/CMS configuration.
Optionals -> Ext Status
Assign DLC system operator position.
Operator -> Positions -> Direct Line
In the hotel configuration, activate Extension Status on the DLC.
Extensions -> More -> Ext Status
Calling Groups
Calling Restrictions
Extension Status 2-165