In the 80s (yikes), I was in a lab with some networked HP machines connected to assorted measuring equipment over HP-IB. But I digress. The network "printer" was a repurposed Teletype Model 43, placed right beside the single lab telephone (a GP0 700 series). I wrote HP BASIC program to stream BEL characters to the printer and make it ring like a telephone. Amazing how many people I could get to stand up and walk over to the phone to answer it. What fun.