IOGear GBHFK231 - Manual (Page 23)

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Voice Dial If you 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.
Last Number
Re-Dailing Short press the MFB button twice under standby mode.