I have a client running a Merlin Legend Release 10 with a DuVoice voicemail. The problem is that the message waiting lights on the non-display (mlx6??) phones will not light up, yet it works all day long on all the mlx10dp's. We have tried to manually light the lights from mlx phones and from the vmail ports, but can not get the non-display phones to light that message light. any ideas?