IOGear GBHFK331 - Manual (Page 23)

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Reject a Call Press and hold MFB button for 2 seconds to reject the call
when you hear the ringing tone.
Voice Dial If your cellular phone voice dialing is enabled, short press the
MFB button under standby mode and say the voice tag after
hearing a beep.
Note: Please ensure to record voice tag into the
cellular phone before using voice dial function.
Functionality varies depending on the phone
models. Please refer to your cellular phone user
manual for details.