AT&T MERLIN LEGEND System Reference Manual page 350

Features
Paging
Park
Personal Lines
Pickup
Pools
When multiple Night Service calls are received in the QCC queue at the same
time and none of the calls are answered by a Night Service member (all group
member Intercom or System Access buttons are busy), new calls are sent to the
QCC queue and can be answered only by the QCC system operator. To avoid
this situation, it is recommended that all outside lines assigned to ring on the
QCCs be assigned as personal lines on at least one group member's telephone.
A QCC cannot make and receive voice-announced inside calls (speakerphone
calls to an individual extension). A QCC cannot be a member of a speaker-
phone paging group. A QCC system operator can use a loudspeaker paging
system only by selecting the feature from the display and can use the Group
Page feature by selecting a Call button and pressing the DSS button or dialing
the extension for the group.
Eight park dial codes are automatically reserved for parking calls from a QCC.
The factory-set extension numbers are 881-888. To assign the park zones to a
DSS connected to a QCC position, the extension numbers must be in the range
programmed for the Page buttons.
A QCC system operator with a DSS parks a call by pressing the DSS button for
the park zone or by pressing the Start button and then the DSS button. The call
is automatically parked (the system operator does not need to press the
Release button). A QCC system operator without a DSS cannot park calls.
To pickup a parked call, the QCC system operator presses the Feature button
and selects Park from the display, then dials the extension number for the
telephone or park zone where the call is parked.
Calls parked by QCC system operators can be programmed to return to the
QCC system operator who parked the calls and/or to another QCC system
operator. Returning parked calls are also assigned a QCC queue priority level
(the factory setting is 4). With Message Center Operation, a call parked by a
QCC system operator can be returned to the Message Center position.
Personal lines cannot be assigned to a QCC.
A QCC can be a member of a Pickup Group. QCC system operators can only
use Individual Pickup and Group Pickup by selecting them from the display.
Individual Pickup and Group Pickup are included on the Home screen on QCCs.
Pool buttons cannot be assigned to a QCC, but a QCC system operator can
select pools to make outgoing calls by pressing a Call button and dialing the
ARS or pool dial-out code. A QCC system operator can be assigned to receive
calls on trunks assigned to pools.
Queued Call Console 2-301