AT&T MERLIN LEGEND System Reference Manual page 429

Features
Park
Pickup
Queued Call Console
Recall
Ringing Options
Saved Number Dial
Signaling
Speed Dial
Station Message Detail
Recording
System Access
2-380 Transfer
A user can park calls by pressing the Transfer button and dialing his or her own
extension or, for DLC system operators, by dialing a system operator park zone.
When using this method, the transfer must be completed by pressing the
Transfer button or by hanging up. This method cannot be used by QCC system
operators.
A transferred call can be answered by using the Pickup features.
The QCC system operator uses the Start and Release buttons, or a DSS button,
to transfer calls. However, pressing the Transfer button on a QCC console is the
same as pressing the Start button. A system operator cannot make or receive
voice-announced transfers When a QCC system operator uses the Start and
Release buttons to transfer a call, the Return Ring Interval applies for transfer
return timing instead of the Transfer Return interval.
The single-line telephone user can use the Recall button to transfer a call if so
equipped.
Transfer returns ring until answered and do not receive Abbreviated Ring.
The Saved Number Dial feature can be used to dial the outside number of the
telephone the call is being transferred to.
A Signaling button can be used to dial the extension after the Transfer button is
pressed. However, Signaling buttons cannot be used to initiate One-Touch
Transfer.
Both Personal and System Speed Dial can be used to dial the number of the
telephone to which the call is being transferred.
The extension number for the station that hangs upon an incoming outside call
is shown in the "Station Extension" field of the SMDR report, regardless of how
many times the call is transferred. For outgoing outside calls, the extension
number for the station that dialed the call is shown on the SMDR report, even if
the call is transferred to another extension.
Transferred calls always arrive on Intercom or System Access buttons. When a
transfer is initiated, the system automatically selects either an Intercom or
System Access Ring, or Intercom or System Access Voice button. If no Intercom
or System Access buttons are available, the caller is put on hold for transfer and
no line is selected (the user is "high and dry"). The user then can select an
Intercom or System Access Originate Only button or a Shared System Access
button (Hybrid/PBX only), can wait for a free Intercom or System Access button,
or can select an outside line button to transfer a call to an outside number.