Need help, the soft keys on my phone do not work, the only thing displayed is MIC, and I can not get it to shut off or on, I want to have the soft keys display MIC, Headrest, Mute, etc... I have no idea how, and am not a programer, just need some help, on how to do that from the phone itself. The phone system is NEAC 2000IVS, Dterm Series E NEC.