Switching Headset /Handset Mode
You can switch between handset mode and headset mode if you have a headset connected to your phone.
In headset mode, you answer or end a call by pressing the [Speaker] button.
Press the [Transfer] button
To use the handset, press  To use the headset, press   
Save the selected entry by pressing the [Transfer] button
NB: If your phone has a headset mode on/off button, press this button. The button’s LED will light when headset mode is set. Press again to return to handset mode. The LED goes off