AT&T MERLIN LEGEND System Reference Manual page 423

Features
Mode Differences
Considerations
2-374 Transfer
One-Touch Hold is the factory setting in the Behind Switch mode. One-Touch
Transfer cannot be programmed in the Behind Switch mode. The selection of
the option is not blocked in system programming; however, the setting is always
One-Touch Hold regardless of which option is chosen.
The other options do not apply to systems that operate in Behind Switch mode.
The Transfer feature of the host switch is used instead of the system's Transfer
feature. When users press a Transfer button, a timed flash is sent to the host
system followed by a programmed access code for the feature. The host
system's Transfer access code must be programmed to ensure proper
operation.
The One-Touch Transfer option does not apply to single-line telephones.
A returning transferred call continues to ring on the telephone it was
transferred to and on the telephone that originated the transfer until either
user answers or the caller hangs up.
If the system is programmed for One-Touch Transfer with automatic
completion, transferred calls always ring; voice announcements cannot be
made.
Transferred calls always arrive on Intercom or System Access buttons or,
when transferred to a QCC system operator, on a Call button.
If a user receiving a voice-announced transferred call selects the personal
line on which the call was originally received instead of the Intercom or
System Access button, the caller is either dropped or returned to the
transferring extension when the Transfer Return Interval expires.
Calls transferred to locations outside the system may vary in transmission
quality.
Calls cannot be transferred to outside numbers on loop-start lines/trunks
unless the loop-start line/trunk is set to reliable disconnect. A reliable
disconnect indicates that a disconnect signal is sent by the local telephone
company to the system shortly after a caller hangs up.
Transferring calls to outside numbers cannot be blocked on an individual
station. However, calling restrictions or Disallowed Lists can be assigned to
individual extensions to prevent outward or toll calls.
When an outside call is transferred to an outside number, two outside lines
are used for as long as the call is in progress.
When calls are transferred to an outside telephone number, the system does
not recognize the transfer until a dialing timeout takes place. The user can
avoid delays by dialing # after dialing the telephone number.