AT&T MERLIN LEGEND Release 2.0 Programming Summary Manual page 50

Introduction
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
started only when the telephone or data terminal being programmed is idle.
assign call restrictions
assign pool dial-out restrictions
copy telephone assignments
assign lines, trunks, or pools to extensions
assign labels to a Personal Directory
use centralized telephone programming
When the telephone is forced idle, a multiline telephone user hears a signal,
indicating that the telephone cannot be used. On a display telephone, the
message
appears. Single-line telephone user does not get a dial tone.
100D Module Idle
The following can be done 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
Wait: System Busy
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Idle States