AT&T MERLIN LEGEND Release 4.0 Feature Reference page 477

Feature Reference
Transfer
Voice Announce
to Busy
The QCC operator uses the Start and Release buttons or a DSS
button to transfer calls. However, pressing the Transfer button on a
QCC is the same as pressing the Start button. A QCC operator
cannot make or receive voice-announced transfers. When the
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.
Voice announcements cannot be received on a QCC.
The ability to make Voice Announce calls can be turned on at a
QCCs in Release 4.0 and later releases only.
Queued Call Console
477