Default Audio Path

By default, when you make a call or answer a call without lifting the handset, the audio is played through the phone's speaker while you speak via the phone's microphone.

If you have a headset attached, you can change the phone's behavior so that the audio is played through the headset by default rather than the speaker.

Procedure

Press the button.
Use the cursor keys to select Options & Settings.
Use the cursor keys to select Audio.
Use the up and down cursor keys to highlight Audio path.
Use the left and right cursor keys to switch between Headset or Speaker.
When completed, press Save.
Press Back/Exit to exit the menus.