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You don't say what headset it is, but I will to help you.
If this is a Plantronics
corded "H" series headset you will need to use an A10 adapter cord,
which plugs into the headset jack on the phone.
If this is what you are
using and you don't hear anything then you need to probably need to
switch to an M22 amplifier box, which is then plugged into the jack where
the telephone handset was plugged in.
If you are using a wireless
headset it plugs into the handset jack where the handset cord was
No. It's a programming item and a code or softkey.
The user connects the modular headset to the handset jack on
the telephone leaving the handset in place. The ON/OFF
button on the Digital Telephone is used to initiate and end calls
while using the headset.
To activate Headset Mode:
Dial  on the dial pad,
Press preprogrammed HEADSET MODE button. LED lights
To deactivate Headset Mode:
Dial  on the dial pad,
Press the preprogrammed HEADSET MODE button. LED
While Headset mode is active, the ON/OFF button
activates the headset and disables speakerphone
and intercom call announce operation at your
To install the headset, see the Installation Manual.
Station must be programmed in database
programming for headset operation before the
flexible button can be programmed.
Some phones have jack on the side of the phone. If it does not, you will need a standard telephone headset with amplifier. You will need a handset button (634) programmed on the phone. Then in programing Flash 50 button 4 you will need to disable speakerphone. Flash 50 button 18 determines the headset type: 0-is amplified unit plugged into handset cord, 1-is 2.5mm jack on side of phone,
To use handset, press handset button so it is lit, use on off to answer calls with the handset.