AT&T MERLIN LEGEND Release 4.0 Feature Reference page 56

Feature Reference
Ringing/Idle Line Preference
Ringing/Idle Line Preference is a single option that controls two aspects of a
telephone's behavior: selection of a line when a call arrives, and selection of a
line when a user goes off hook. Turn this option on or off for each extension
through extension programming or centralized telephone programming, using
the display or programming codes. When Ringing/Idle Line Preference is on for
an extension, the system selects a line button automatically, as follows:
Ringing Line Preference selects a ringing outside line, SA or ICOM
button, or Cover button; that is, the red LED turns on next to the button
with the ringing call. If you lift the handset or press the Speaker button,
you are automatically connected to the ringing call.
The button must be programmed for Immediate Ring or Delay Ring. The
red LED next to a button programmed for No Ring does not turn on
unless you press that button to select that line. See "Ringing Options" for
additional information.
Idle Line Preference selects an available outside line, SA, or ICOM button
for an outgoing call. If you lift the handset or press the Speaker button
when no call is ringing, the red LED turns on next to an available line
button, and you are automatically connected to that line.
On is the factory-setting for Ringing/Idle Line Preference for all extensions. If
Ringing/Idle Line Preference is turned off for an extension, no line button at that
extension is ever selected automatically. The red LED is never on until you
press the line button with a ringing call (flashing green LED) or an available line
button (green LED off) to make a call.
Automatic Line Selection
When Ringing/Idle Line Preference is turned on at an extension, the system
uses the programmed ALS sequence to select an idle SA or ICOM button or
outside line button for originating a call. When you lift the handset or press the
Speaker button without selecting a line button, the red LED next to the first
button in the programmed sequence turns on and you are connected to that
line. If the first line is busy, the system selects the second button in the
sequence, and so on.
For example, if you normally make toll calls, a WATS line assigned to the
extension can be programmed as the first line in the sequence, and local lines
as the second, third, and so on. When you lift the handset or press the Speaker
button, the WATS line, if available, is selected automatically.
On a multiline telephone you can override ALS by pressing the preferred line
button before you lift the handset or press Speaker (the red LED next to the
selected button turns on).
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Automatic Line Selection and Ringing/Idle Line Preference