Samsung HM1700 - Manual (Page 21)

English
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Adjusting the volume
Press the Volume up or down button to adjust the volume.
You will hear a beep when the volume level of the headset reaches it's lowest
or highest level.
Muting the microphone
Press and hold the Volume up or down button to turn the microphone off so that
the person with whom you are speaking cannot hear you. When the microphone
is turned off, the headset beeps at regular intervals. Press and hold the Volume
up or down button again to turn the microphone back on.
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.