Your phone supports a headset with a standard headset jack. When the headset is installed using the headset jack, you do NOT have to lift your handset to make or answer a calling using your headset.
First let's learn how to install your headset:
Did you know? Every headset is unique. Refer to the headset owner's manual for accurate installation instructions. Once the headset is installed, you may need to adjust dipswitch settings (also found in your headset's manual).