The headset is plugged in the headset slot on the side on the phone.
To turn the headset mode on and off, press “headset” button on the phone. The headset icon on the idle screen indicates that the headset is activated, the icon does not shown when it is deactivated.
Press the line key or the 'Answer' soft key to answer a call, the call will connect to your headset automatically.
Enter the desired number and press the 'Send' soft key, then the phone will place a call using the headset automatically.