I have a client who moved and somehow has "lost" the phone that had his MFM inside that he used for calls in queue status in a calling group. I have his light, and have purchased an MFM and installed in in an MLX phone in my office. I would like to test the setup before going to his site to make sure both the MFM and the light are working and have no idea how to test. I called the adjunct number associated with the MLX (my naive logic assumed that would work) but the light doesn't light. Does anyone know an easy way to make the light ring?