Nokia HDW-3 - Manual (Page 19)

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You can also answer the call by using your phone in the normal way.
When you receive a call, you hear a ringing tone selected on your phone also
through the headset.
■ Ending a call
Press the answer/end key to end the currently active call.
You can also end the call by using your phone in the normal way.
■ Rejecting a call
If you do not want to answer a call, briefly press the answer/end key twice.
■ Automatic answer
If the Automatic answer function is set on in your phone, the phone automatically
answers the incoming call after one ring.
■ Adjusting the earphone volume
Press the volume up key to increase or the volume down key to decrease the
volume. To adjust the volume quickly, press and hold either of these keys.
■ Switching the call between phone and headset
You can switch the active call between the headset and the phone. This
functionality is supported in all compatible Nokia phones.