Mitel 4125 SX-200 - Manual (Page 37)

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Headset Operation (Headset 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 telephone to handset mode.
To answer a call:
z
Press the flashing Line Appearance key
-
OR -
Quickly press and release the headset's feature control switch.
-
OR -
Lift the handset(see Note 1).
To mute the headset microphone:
z
Press and hold the headset's feature control switch.
To hang up:
z
Press CANCEL.
-
OR -
Quickly press and release the headset's feature control switch.