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| Originally Posted by sheerhunk They make message waiting Indicators .I installed one on an analog line and it mounted to a wall .It was used for some It help desk people to know when there was a message in voice mail.Don't remember who made it tho. |
This would be the simplest, most cost effective way to accomplish what you want.
One that I've seen used quite alot, set up the way sheerhunk says, is called a "beehive" lamp (due to its resemblance to a beehive). Suttle makes one (Model SE-15) with different colored lenses. Other manufacturers have variations on the same thing and pretty much any electrical supply house should have them.