IOGear GBHFK231 - Manual (Page 21)

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Rejecting call from the second phone
When a new call comes in on the second phone, press and hold MFB button for
3 seconds to reject the call from the second phone.
Switch between two calls on two phones
Quick tab the MFB button twice to switch between the calls on two phones.
When on an active call, short press MFB button to end the call and stay with the
other call.