AT&T MERLIN LEGEND System Reference Manual page 308

Features
Hold
Line Request
Multi-Function Module
Music-on-Hold
Pickup
Queued Call Console
Recall
Station Message Detail
Recording
System Access
System Numbering
If a single-line telephone user with a call on hold hangs up, the call is
disconnected. Park should be used instead of Hold. When a user or system
operator parks a call received on a Personal Line button and it is picked up at
another telephone and put on hold by using the Hold button, other users who
share the personal line cannot press the line button and pick up the call.
Returning parked calls cancels Line Request.
An MFM user cannot park a call but can pickup a call parked by another user.
A parked caller hears Music-on-Hold.
A parked call can be picked up by using Individual Pickup.
Eight park zone dial codes are automatically reserved for parking calls from a
QCC. The factory-set extension numbers are 881-888. For the park zones to be
assigned to a DSS connected to a QCC position, the extension numbers must
be in the range programmed for the Page buttons.
Only a QCC system operator with a DSS can park calls on DSS buttons that
correspond to the system operator park zones. A QCC system operator without
a DSS cannot park calls, and a QCC system operator cannot park a call by
using the console's extension number.
Calls parked by QCC system operators can be programmed to return to the
QCC queue or can be assigned to the QCC system operator who parked the
calls and/or to another QCC system operator. Returning parked calls are
assigned a QCC priority level (the factory setting is 4) by using Message Center
Operation. A QCC system operator can return a parked call to the Message
Center position.
A single-line telephone user can use Park if the telephone has a Recall button.
If an incoming call is parked but not picked up by the other extension, the
extension of the user who activated Park is shown in the "Station Extension" field
of the SMDR record for the call. If an incoming call is parked and picked up by
the destination extension, the destination extension is shown in the "Station
Extension" field of the SMDR report.
When a user parks a call made or received on a System Access button, Shared
System Access buttons do not ring when the parked call returns.
System operator park zones (the factory-set zones are 881-888) can be
renumbered.
Park 2-259