Samsung HM1700 User Manual page 24

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.
This function is only available when using the Hands-Free profile.
Answering a second call
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Press the Talk button to end the first call and answer a second call.
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Press and hold the Talk button to place the first call on hold and answer a second call.
To switch between the current call and the held call, press and hold the Talk button.
This function is only available when using the Hands-Free profile.
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