Samsung BHM3200 - 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.