GENNUM 5000 - Manual (Page 18)

18 Features
TM
Transferring the Call between Mobile Phone and Headset
(This function only works in Hands-Free Profile)
To Transfer the Call from the Headset to the Phone
Press and hold the PINCH button until you hear 1 beep, then immediately
release the button.
To Transfer the Call from the Phone to the Headset
Press and hold the PINCH button until you hear 1 beep, then immediately
release the button. There may be a few seconds delay before the call is
transferred.
Call Waiting
(This function only works in Hands-Free Profile)
To Accept the Waiting Call and place the First Call On-Hold
Press and hold the PINCH button until you hear 1 beep, then immediately
release the button.
To Swap Between the Active and the Held Call
Press and hold the PINCH button until you hear 1 beep, then immediately
release the button.