AT&T MERLIN LEGEND Release 4.0 Feature Reference page 282

Feature Reference
Two things are necessary for an MLX telephone user or MLX DLC operator to
use the Headset Auto Answer feature:
A Headset Hang Up button must be programmed, as described earlier in
this section.
A Headset Auto Answer button must be programmed on the telephone or
console, either through extension programming or through centralized
telephone programming.
NOTE:
Users who have extensions programmed for Headset Auto Answer may also
receive Caller ID information provided by a loop-start line/trunk connected to the
800 GS/LS-ID module. They should set the line buttons (SA, ICOM, or other)
where the Caller ID information arrives to Delay Ring so that Caller ID
information is not lost.
A Headset Auto Answer button is a fixed feature on a QCC and cannot be
deleted or changed.
Headset/Handset Mute
Headset/Handset Mute allows an MLX telephone user or operator to turn the
microphone in the headset or handset off and on. The user or operator can then
talk privately with another person in the same room without the caller hearing the
conversation. If headset operation is on, Headset/Handset Mute turns off the
headset microphone; if headset operation is off, Headset/Handset Mute turns off
the handset microphone. The red LED next to the Headset/Handset Mute button
is on when the headset or handset microphone is off; it is off when the headset
or handset microphone is on.
When headset operation is off, the handset microphone can be turned off using
Headset/Handset Mute only when the user lifts the handset.
When headset operation is on, the user presses the programmed Headset Hang
Up button to end an outside call even if the caller hangs up. For an MLX
telephone user or MLX DLC operator to use Headset/Handset Mute, a
Headset/Handset Mute button must be programmed on the telephone or
console, either through extension programming or through centralized
telephone programming.
A Headset/Handset Mute button is a fixed feature on a QCC and cannot be
deleted or changed.
Considerations and Constraints
The headset, handset, and speakerphone can be used only one at a time.
Headset Hang Up cannot be programmed on a QCC.
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Headset Options