It's kinda practical too, for instance I could see if two extensions are near each other, but far from the caller, it might be hard to tell which extension was buzzed -- "Was that your buzzer or mine?"
I cannot count how many times I have been on a customer site fir the first time trying to reprogram a defaulted database and the customers have no idea who's telephone ring on incoming calls!
I wont post a pic of my backboard (because its a mess) but in order for it to work on my system I have a Melco intercom and its 66 block then the FL2000 and its block plus all the associated wiring.
Shawn, it's okay to post it, but perhaps under a different thread.