AT&T MERLIN LEGEND System Reference Manual page 157

Features
Personal Lines
Pickup
Pools
Queued Call Console
Reminder Service
Remote Access
Speed Dial
System Access
2-108 Direct-Line Console
A system operator can program the Park zone codes on inside Auto Dial
buttons. An inside Auto Dial button can also be programmed with a user's
(including a system operator's) own extension number and can be used to park
calls. When the system is programmed for One-Touch Hold with manual
completion, the user hears a busy signal and completes the transfer by hanging
up or pressing the Transfer button.
The factory setting in all modes for analog DLCs is that the first 32 lines
connected to the system are automatically assigned as personal lines. For
digital DLCs the first 18 lines connected to the system are automatically
assigned as personal lines.
A DLC can be part of a Pickup group. This allows other group members to
provide backup coverage for the DLC. In turn, the DLC system operator use
Pickup to answer calls on line/trunks that are not assigned to buttons on the
console.
In the Hybrid/PBX mode, a Pool button cannot be assigned to a DLC. The DLC
system operator uses trunks in pools by dialing the pool dial-out code from a
System Access button, or on a digital DLC with a DSS, by pressing the DSS
button associated with the pool dial-out code. Trunks assigned to pools can be
assigned as personal lines (assigned to line buttons) only on a DLC.
Both DLCs and QCCs can be assigned in the Hybrid/PBX mode. The maximum
combined number of system operator positions is eight; no more than four can
be QCCs. In a system with both DLC and QCC positions, the primary system
operator position must be a QCC. All "dial 0" calls are directed to the QCC
queue and do not ring at any DLC positions.
A DLC cannot use Position Busy, which is used only for QCCs. A DLC cannot be
assigned as a Position Busy backup for a QCC (only calling groups can provide
backup for a QCC).
DLC system operators can use Reminder Service to set or cancel reminders for
other users. The system operator can also see when a reminder was missed
(the user did not answer the call) and cancel the missed reminder. The Missed
Reminder feature can be used only on system operator positions.
Invalid Remote Access calls can be programmed to ring on an Intercom or
System Access button on a DLC.
System Speed Dial numbers, the system date, and the system time can be
programmed from the first DLC connected to the first analog station jack.
Shared System Access buttons cannot be assigned to DLCs.