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Headset Operation (with Feature Control Switch)
IMPORTANT NOTE: Mitel Networks Headsets with Feature Control Switch
(PN9132-800-500-NA/9132-800-501-NA) must be installed in the dedicated
headset jack (the jack nearest the front of the phone). Installation will
disable your handset microphone. Disconnecting the headset at the jack or
at the quick-disconnect plug restores handset operation. If handset
operation is required for an extended period of time, you should press the
Headset feature key to return the phone to handset mode.

To enable Headset Operation:

zPress the Headset feature key.

To answer a call:

zPress flashing Line Appearance key
-OR-
Quickly press and release the headset's feature control switch.

To mute the headset microphone:

zPress and hold the headset's feature control switch.

To hang up:

zPress CANCEL.
-OR-
Quickly press and release the headset's feature control switch.

To disable Headset Operation:

zPress the Headset feature key.