AT&T MERLIN LEGEND Release 4.0 Feature Reference page 285

Feature Reference
Privacy
Ringing Options
Ringing/Idle Line
Preference
Transfer
Privacy should be programmed when headset users with Headset Auto
Answer on have Shared SA buttons or share one or more personal
lines. Privacy keeps the users from competing for the same call. When
two or more users answer the same call on a Shared SA or personal
line button, the red and green LEDs next to the button go on, but only
one person can talk with the caller.
Headset Auto Answer does not automatically answer calls ringing on
buttons programmed for No Ring. A user must manually select the
button to answer the call. When Abbreviated Ring is programmed, the
user hears an abbreviated ring if another call comes in while he or she
is already on a call.
Ringing Line Preference does not operate if Headset Auto Answer is
turned off while headset operation is active. To answer a call, press the
button with the ringing call. Idle Line Preference does not operate when
headset operation is active. Select a line button manually before making
an inside or outside call.
When an MLX telephone user (except for a QCC operator) transfers a
call, Headset Auto Answer is turned off and must be turned on manually
to resume using the feature.
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Headset Options