AT&T MERLIN LEGEND System Reference Manual page 246

Features
Headset/Handset Mute
Headset Hang Up
Headset Status
Headset Auto Answer must be programmed on a button and can be used only
on MLX telephones, digital direct-line consoles (DLCs), and queued call
consoles (QCCs).
Headset/Handset Mute allows an MLX telephone user to turn the microphone in
the handset or headset on and off. The user can converse privately with another
person without the caller hearing the conversation.
When headset operation is activated, pressing the Headset/Handset Mute
button turns the headset microphone on and off. When headset operation is
deactivated, pressing the Headset/Handset Mute button turns the handset
microphone on and off. The green LED next to the button is on when the
headset or handset microphone is off and off when the headset or handset
microphone is on.
Headset/Handset Mute must be programmed on a button and can be used on
MLX telephones, digital DLCs, and QCCs.
With Headset Hang Up an MLX telephone user with a headset can disconnect
calls manually. Headset Hang Up takes the place of the switchhook operation
that is disabled when the telephone or console is in the headset operation
mode.
When the Headset Hang Up button is programmed on the telephone or console,
headset operation is automatically activated and the user can use a headset
instead of a handset to answer calls. When the Headset Hang Up feature is
removed from a button, headset operation is automatically deactivated.
To allow a user to manually activate and deactivate headset operation, a
Headset Status button can be programmed in addition to the Headset Hang Up
button. This allows the user to switch between using the handset and using a
headset. To use Headset Hang Up when a Headset Status button is
programmed, the user must press the Headset Status button to activate headset
operation (the green LED next to the button goes on to indicate headset
operation is active).
Headset Hang Up must be programmed on a button via centralized telephone
programming only and can be used only on MLX telephones and digital direct-
line consoles (DLCs). A Headset Hang Up button is not needed and cannot be
programmed on a QCC.
Note: The user should deactivate headset operation before removing the
Headset Hang Up feature from a button. If headset operation is active, the user
exits telephone programming prematurely.
With Headset Status an MLX telephone user can manually activate and
deactivate headset operation on the console or telephone. This allows the user
to switch between using the handset and using the headset.
Headset Options 2-197