BRP headsets are set up. Passenger headset can hear radio and adjust volume and use PTT. Rider headset hears radio and can hear passenger when passenger uses PTT. When driver uses PTT passenger does not hear rider. Have checked connections of head set on helmet and are secure. Connections for cords secure on bike. PTT cord checked and is functioning properly. Transmission of driver checked via another vehicle with CB and driver is transmitting as was heard on CB in other vehicle. What else is there to check? Have checked the VOX and preference settings multiple times.