Samsung WEP650 - Manual (Page 14)

English Transferring.a.call.from.the.phone.to.the.headset
Press the talk button to transfer a call from the phone to the headset.
Placing.a.call.on.hold
Press and hold the talk button to place the current call on hold.
Answering.a.second.call
Press the talk button to end the first call and answer a second call when
you hear call waiting tones.
Press and hold the talk button to place the first call on hold and answer
a second call when you hear waiting tones.
To switch between the current call and the held call, press and hold the
talk button.