AT&T MERLIN LEGEND Release 3.1 System Programming Manual page 730

Feature Quick Reference
Summary: Automatic Line Selection
Telephones
Mode
Programmable by
Programming Code Enter:
Display Label
Barge-In
Assign a button to allow an operator to interrupt a user's call in an emergency.
Summary: Barge-In
Telephones
Mode
Programmable by
Programming Code
Display Label
Callback
With Automatic Callback turned on, the system retries calls to busy extensions or
busy trunk pools. Assign a Selective Callback button to allow the system to retry
calls to busy extensions or busy trunk pools on a call-by-call basis.
NOTE:
To use the Callback feature on loop-start lines/trunks, the loop start line/trunk
must be programmed for reliable disconnect. See "Disconnect Signal
Reliability," in Chapter 4, "Programming Procedures."
Summary: Automatic Callback
Telephones
Mode
Programmable by
Programming Code On:
Display Label
Analog multiline and all MLX telephones
All
User and system manager
*
Exit:
All except single-line telephone or QCC
All
System manager only
All
All
User and system manager
Off:
Centralized Telephone Programming
5–15