Samsung HM3500 Manual page 19

Dialling.a.number.by.voice
Press and hold the Talk button, and then say a name to dial a number by voice.
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.
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