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The green light labeled “MESSAGE” has no function. But since it’s purpose is to work with other voicemail systems, you may occasionally see it flash as it looks for data. The L1 and L2 lights are “Line In Use” indicators for your main and second line. L1 will light when you pick up the phone, or if someone you share the same number with is on their phone. It will also flash when your phone rings. The L2 light works in the same fashion, except that you will need to select it to call out on that l