AT&T MERLIN LEGEND System Reference Manual page 305

Features
All Other Multiline
Telephones
Single-Line Telephones
Considerations
See "Paging" in this chapter for more on
Loudspeaker and Speakerphone
Paging.
2-256 Park
A multiline telephone user parks a call on their own extension number by
pressing a programmed Park button. MLX display telephone users can also
press the Feature button and select Park from the display. A DLC system
operator parks a call by pressing a button programmed for a specific park zone.
If a user or system operator pages another person, the extension number for the
telephone or park zone should be provided as part of the call announcement.
A multiline telephone user can also park calls by pressing the Transfer button,
dialing his or her own extension number (the user hears a busy tone), and then
pressing the Transfer button again or hanging up to complete the transfer. The
call is automatically parked when the transfer is completed. A DLC system
operator can use this method to transfer calls to the park zone extensions. DSS
or Auto Dial buttons can also be used to transfer a call to a park zone.
To pickup a parked call, the multiline telephone user presses a programmed
Pickup button or presses the Feature button and dials the Pickup feature code
(9), and then dials the extension number for the telephone or park zone where
the call is parked. MLX telephone users can also press the Feature button and
select the feature from the display.
To park a call, the single-line telephone user presses and releases the Recall
button or switchhook and dials his or her own extension. The call is automatically
parked, and the user can hang up. Single-line telephone users cannot use park
zones to park calls.
Note: If a single-line telephone with a timed disconnect is used (for example
AT&T models 2500YMGK-PEC3178-NHL and 2500MMGK-PEC3101-ETR),
pressing the switchhook disconnects the call. With this type of telephone, the
Recall button must be used instead of the switchhook to park a call.
To pickup a parked call, the single line user lifts the handset (while listening to
internal dial tone), dials #9, and then dials the extension number for the
telephone or park zone where the call is parked.
Users (excluding QCC system operators) can park calls only at their own
extensions. Only system operators can use park zones to park calls.
The system automatically reserves eight extensions (881-888) for system
operator park zones. Only system operators can use these park zone
extensions to park calls.
Two intercom or System Access buttons are required when users park calls
by using their own extensions. If a user (such as a DLC system operator)
must park more than one call, more Intercom or System Access buttons
should be assigned to the telephone.