AT&T MERLIN LEGEND Release 4.0 Feature Reference page 281

Feature Reference
A Headset Status button is a fixed feature on a QCC and cannot be deleted or
changed.
To use Headset Auto Answer, Headset/Handset Mute, or Headset Hang Up on
a telephone or console with a Headset Status button, Headset Status must be
on.
When Headset Status is on, switchhook operation is disabled. The handset or
speakerphone can be used to make or answer a call, but the only way for the
user or operator to disconnect from a call is by pressing the Headset Hang Up
button. The user or operator can turn off the headset and switch back to
switchhook operation by pressing the Headset Status button (the green LED
next to the button turns off).
Headset Auto Answer
A Headset Auto Answer button allows an MLX telephone user or operator with a
headset to be connected automatically to a ringing call. Headset Status must be
on, as described in the two previous sections before Headset Auto Answer can
be used.
When Headset Auto Answer is turned on (green LED next to Headset Auto
Answer button is on), the user or operator hears a zip tone through the headset
to indicate an incoming call. Following the tone is a brief pause, during which
the microphone is temporarily disabled to prevent the user's or operator's
private conversation from being heard by the caller.
If a user with Headset Auto Answer on presses the button with a ringing call (for
example, when Ringing/Idle Line Preference is turned off), the call is answered
without the user hearing zip tone.
Headset Auto Answer can be turned on and off during a call without
disconnecting the caller and takes effect immediately.
Headset Auto Answer does not automatically answer voice-announced calls.
When the user or operator is on a call, Headset Auto Answer is turned off; calls
are not answered automatically until the caller hangs up or the user or operator
presses the Headset Hang Up button to disconnect the call.
When the user or operator has a call on hold or is in the process of transferring
a call or setting up a conference, Headset Auto Answer is also turned off. If the
user or operator pressed the Conf, Hold, Direct Voice Mail (to transfer to voice
mail), or Transfer button, he or she must press the Headset Auto Answer button
to turn the feature back on before another call can be answered automatically.
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Headset Options