I have a Avaya G3R that has a strange problem. When a incoming call comes in the phone will go into a abnormal interupted ringing pattern and then a steady ring tone before it cuts off completely, the phone call never connects. Also the lights on the phone will start blinking. You have to unplug the phone to clear. I have 3 cabinets but it happens on just one. This is intermitting.Any ideas. Thanks