FAQ > Phone Instructions > Q. How do I turn the message light off if I have listened to the new messages?
A. If you have a Toshiba Phone System and the message indicator light has not turned off after checking new messages, press intercom (ICM), then “ # “, then “ 409 “ with the handset down. This command will turn out the light.
If you have a WIN Phone System, press “ FEAT “, then “ MIC “, then “ FLASH “ to turn off the message indicator light.