Samsung WEP650 - Manual (Page 13)

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Dialing.a.number.by.voice
Press the talk button to dial a number by voice, and say a name.
Answering.a.call
Press the talk button to answer a call when you hear incoming call tones.
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.
Using.options.during.a.call
You can use the following functions to control your call during a call.
Muting.the.microphone
Press and hold the volume up/down buttons to turn the microphone off
so that the person with whom you are speaking cannot hear you. Press
and hold the volume up/down buttons again to turn the microphone
back on.