Mitel 4150 - Manual (Page 36)

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Handset Mute
To mute your handset's microphone during a call:
z
Press the Handset Mute feature key.
To restore handset microphone operation:
z
Press the Handset Mute feature key again.
Headset Operation
To use a headset with your phone, ensure that the headset is connected to
the dedicated jack on the bottom of the phone.
To answer a call (when Auto Answer is disabled):
z
Press the flashing line key.
To switch between headset and handset operation while in a call (see
Note 2):
z
Press the Handset Mute key.
To hang up:
z
Press CANCEL or the Hang-up softkey.
Notes:
1. Lifting the handset on some SUPERSET 4150 phones while it is in headset
mode also answers the call.
2. This feature is available on some versions of the SUPERSET 4150 phone
only.
3. Disconnecting the headset while in a call, puts your phone in
speakerphone mode. You can hear the other party but they cannot hear
you. To talk to the other party, press MICROPHONE; to hang up, press
SPEAKER.