This usually mean 1 of 3 things: Either the Handset lifter is not over the speaker, the ring sensor is off, or the ringer sensitivity control is turned down. 1) If there is no ring then it could mean the ring speaker on the phone is not directly underneath the lifter. In order to detect the ring, the lifter's sensor must be directly over the phone's speaker. Try repositioning sensor (4) by sliding it up or down. If it still is not over speaker, then you must use the external ring sensor. The ring sensor plugs into the back of the lifter and then sticks down to the phone's speaker, wherever that speaker happens to be. 2) The ring sensor is off. You can tell if the ring sensor is off by checking the indicator light on top of the lifer (5). If the light is flashing, this means the ring sensor is OFF (the liter arm must be in the down position to check this, so the headset itself must be turned off before you can proceed. You can tell if the headset is turned on by looking at the same ind…