Samsung BHM1800NDACSTA - Manual (Page 20)

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Dialing a number by voice
Press the Talk button.
This function is only available on the primary phone.
Answering a call
Press the Talk button to answer a call when a call comes in.
Rejecting a call
Press and hold the Talk button to reject a call when a call comes in.
If you receive calls on both connected devices at the same time you can only answer or reject the
call on the primary phone.
Ending a call
Press the Talk button to end a call.