There are people around and sites on the internet that do that kind of stuff.I tried to do something like you want to do,but I had a hard time trying to understand through their technical jargon.I finally did find one of them that pretty much said,hook this to that,power up that other thing,and that'll work.My aunt had a little lunch counter in ther front room,mostly for the sawmill workers next door.In that front room was a switchboard,for that area.She would feed people and plug cords in that thing at the same time.My dad was born in 36,and remembers eating in there while she ran the switchboard.I was born in 56,and remember eating in there,but the switchboard was just an ornament at that time.There was kind of a community phone that sat on her desk after that.We lived about 1000 feet away,through the woods,and I remember getting our own phone in the summer of 1960.