AT&T MERLIN LEGEND Release 4.0 Feature Reference page 265

Feature Reference
Do Not Disturb is off.
Calls are not being forwarded through Forward, Remote Call Forward, or
Follow Me.
The calling group member has not activated Callback to reach a busy
trunk (Hybrid/PBX mode only) or extension.
The calling group member is not about to receive a call from another
extension who has used Callback to reach the member.
Calling Group Options
This section describes the Group Calling options assigned through system
programming and available only for calling groups.
Calling Group Supervisor Position
The calling group supervisor position is a Direct-Line Console (DLC) with
Extension Status assigned through system programming. The calling group
supervisor monitors and controls calling group activity by using the LEDs and
programmed buttons on the console or DSS.
The supervisor console should include the following programmed buttons:
For each calling group member, one button programmed with the
member's extension, on the telephone (inside Auto Dial) or optional DSS.
A Calls-In-Queue Alarm button (either on the console or on a DSS),
programmed with the calling group's extension, for monitoring calls in
queue. A supervisor who manages more than one group needs a button
for each group.
Status buttons for controlling calling group member availability; an
Available (ES2) button and an Unavailable (ES0) button. Extension Status
features allow a calling group supervisor to change and monitor calling
group members' status (and enable members to sign in and out of the
calling group). See "Extension Status" for additional information.
Hunt Type
The placement of each extension in the hunting sequence used by the system
to search for an available calling group member is determined by the order in
which each extension is assigned to the group during system programming.
When the first call arrives for a calling group after a system is installed or
restarted (cold start), the system searches for an available group member,
starting with the first extension assigned to the group during system
programming.
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Group Calling