Samsung BHM1600 - Manual (Page 18)

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Dialling.a.number.by.voice
Press and hold the Talk button to dial a number of the first phone by voice, and say
a name.
Available call functions may vary by the phone.
Answering.a.call
Press the Talk button to answer a call when you hear incoming call tones.
When two calls from the two connected phones come in, you can answer the call
of the first phone.
Ending.a.call
Press the Talk button to end a call.
Rejecting.a.call
Press and hold the Talk button to reject a call when a call comes in.
When two calls from the two connected phones come in, you can reject the call
of the first phone.