AT&T MERLIN LEGEND Release 3.0 System Programming Manual page 63

Idle States
Line or Trunk Idle
Because these procedures require the line or trunk to be idle only at the instant
of programming, the line or trunk is not forced idle (as described in the previous
paragraph). The following procedures can be performed only when the line or
trunk being programmed is idle:
Identify loudspeaker paging extension jack.
Assign trunks to pools.
Specify incoming or outgoing DID or tie trunk type.
Specify tie trunk direction.
Specify tie trunk E&M signal.
Extension Forced Idle
When a telephone or data terminal is forced idle, no calls can be made or
received on that telephone or data terminal. The following procedures can be
performed only when the telephone or data terminal being programmed is idle:
Assign call restrictions.
Assign pool dial-out restrictions.
Copy extension assignments.
Assign lines, trunks, or pools to extensions.
Assign labels to a personal directory.
Use centralized telephone programming.
When
the telephone is forced idle, the following occurs: multiline telephone
users hear a signal, indicating that the telephone cannot be used; display
telephone users see the message Wait: System Busy; single-line telephone
users do not hear a dial tone.
Module Idle
100D
The following procedures can be performed only when the 100D module is idle:
Specify board type.
Specify frame format.
Specify board signaling format.
Specify board suppression format.
Specify board facility compensation.
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Programming Basics