You have a 7731 phone. The phone system could be any one of 18 Panasonic cabinets, but probably a TA series. Voice mail could be a BV, TVx box, or central office based. If CO based, an 824 will listen for the stutter dial tone and light the MW light on a phone. There are instructions to make that work.
So, try editing your question to give a bit more information and it makes it easier to give you an answer.
Carl
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