AT&T MERLIN Attendant System Manager's Manual page 17

Overview
Transfer Fail announcement
This announcement informs the caller when a call cannot be
completed.
Example: "The extension you requested is busy. Please hold or
dial another extension."
Connect announcement
This announcement informs the person at the extension dialed
that a call is being transferred.
Example: "A call is being transferred to you."
NOTE:
You can also record an announcement that provides business
hours or related information then disconnects without giving
callers the option to enter a route or extension.
When a call is not answered or the extension is busy, the
MERLIN Attendant retrieves the call and handles it one of two
ways:
If a secondary extension is programmed, the MERLIN Attendant
transfers the call to a secondary extension when the first
(primary) extension is unavailable.
When callers enter a route or extension number, the Hold
announcement plays, and their calls are transferred to the first
(primary) extension, If the first (primary) extension is busy or
does not answer, the MERLIN Attendant dials the secondary
extension while the caller remains on hold. If the secondary
extension is also unavailable, the caller is taken off hold and the
Transfer Fail announcement is played.
The number of rings (2 to 6) allowed before a call is transferred
from the first (primary) extension to the secondary extension is a
programmable setting, see "Call Processing Options" in Chapter
2, "Changing the Current Setting." You can also set the number
of rings with the MERLIN LEGEND ring-delay option for the lines
at that station, see the "MERLIN
1-8 Key Features
®
Attendant Installer's Guide."