Samsung Mono & Stereo HM3500 Guide Rapide page 21

Using.options.during.a.call
You can use the following functions to control your call during a call.
Adjusting.the.volume
Press the Volume up or down button to adjust the volume.
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.
When the headset is connected with two phones, this function is not available.
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