atcomsystems.ca/forum Forums TDM Business Telephone Systems Panasonic Telephones & Systems Message Waiting Lamps

I have the same setup as you in my office and have had this issue before. Did Message Waiting Lamp Status get changed perhaps?

To find that out you can go into the system manager's mailbox 999, press 2 to setup message waiting notification, then press 1 to enable/disable message waiting lamp notification.

Hope this helps some.
Thomas