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.
1.Press the button.
2.Use the up and down cursor keys to highlight Call Settings.
4.Use the up and down cursor keys to highlight Audio Path.
5.Press Change to change the setting between Headset and Speaker.
6.When completed, press the Save soft key.
7.Press the Back / Exit soft keys to exit the menus.