I use the NEC Dterm Series i phones, 16 button and I'm having trouble with the "speed dial" lights. I set up the one-touch buttons to speed dial extensions so when the person is on their extension the red light is lit up. As of right now, I program by pressing the Conf button, then the button I want to program, I enter the extension number and press Conf to SET the button. When I press the button to speed dial, it dials the extension but the lights do not light up. I swapped the phones thinking the row of lights are no longer working but that did not fix the problem. Any suggestions?