AT&T MERLIN LEGEND Release 4.0 Feature Reference page 280

Feature Reference
For the user or operator to be able to use the headset, a Headset Hang Up
button must be programmed (centralized telephone programming) for an MLX
telephone or MLX DLC.
Headset users should press the Headset Hangup button after each call. If the
user does not press the Headset Hangup button, new calls still arrive correctly,
but the LED status of the extension (as shown on other extensions and DSSs) is
not updated.
A Headset Hang Up button is not needed and cannot be programmed on a
Queued Call Console (QCC).
To give control of headset/handset operation to an MLX telephone user or MLX
DLC operator who has a Headset Hang Up button, a Headset Status button can
also be programmed, as described in the next section. On a telephone or
console with a Headset Hang Up button but without a Headset Status button,
headset operation is always on.
NOTE:
If an MLX telephone or MLX DLC has a Headset Status button and/or a Headset
Auto Answer button (described in the following two sections) in addition to a
Headset Hang Up button, the Headset Hang Up button can be removed
through centralized programming, without removing the Headset Status or
Headset Auto Answer button. If either of these features is on, the green LED
next to the button stays on. However, the telephone or console is no longer in
headset operation and neither the Headset Status nor the Headset Auto Answer
button has any effect, whether on or off, until a Headset Hang Up button is
reprogrammed for the extension.
Headset Status
When a Headset Hang Up button is programmed on an MLX telephone or MLX
DLC, Headset Status is automatically turned on. Programming a Headset Status
button also allows the user or operator to turn headset operation off and on
manually. With headset operation on (green LED next to Headset Status button
is on), the user or operator answers and makes calls with the headset. With
headset operation off (green LED next to Headset Status button is off), the user
or operator answers and makes calls with the handset. Two conditions are
necessary for an MLX telephone user or MLX DLC operator to use the Headset
Status feature:
A Headset Hang Up button must be programmed, as described in the
previous section.
A Headset Status button must be programmed on the telephone or
console, either through extension programming or through centralized
telephone programming.
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Headset Options