AT&T MERLIN LEGEND System Reference Manual page 306

Features
Feature Interactions
Auto Dial
Callback
Conference
An individual system operator can park a maximum of eight calls. However,
only eight park zones are available per system and are shared by all system
operators.
Users can also park calls by transferring the call to their own extension (or for
system operators, to the park zone) and, either pressing the Transfer button
again or hanging up to complete the transfer.
Only queued call console (QCC) system operators with DSSs can park calls.
A QCC system operator without a DSS cannot park calls, and QCC system
operators cannot park calls on their own extensions.
To park a call at a park zone, the system operator with a DSS presses the
DSS button for the park zone while the caller is on the line. If a system
operator tries to park a call by pressing the Transfer button followed by the
DSS button for the park zone, the call is put on hold for transfer and is not
parked. This may result in transferring a call to an outside number in error.
The programmed Park Interval (30-300 seconds in increments of 10
seconds) determines the number of seconds or minutes that a call remains
parked before it returns to the person who parked it. The factory setting is
180 seconds.
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 automatically disconnects the call. With this type of
telephone, the Recall button must be used instead of the switchhook to park
a call.
For QCC system operators only, returning parked calls can also be
programmed to return to a different system operator.
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 must complete the transfer by
hanging up or by pressing the Transfer button.
Calls waiting in a Callback queue cannot be parked.
Conference calls can be parked by all users except a QCC system operator;
however, they remain parked and do not return to the originating telephone if the
Call Park Interval is exceeded. If a QCC system operator tries to park a
conference call by pressing the Start button and then pressing the DSS button
for the park zone, the park is denied and the system operator is reconnected to
the conference call.
Park 2-257