I saw someone had a question a couple of years ago about connecting his intercom (which used a phone line) to a rPi and none of the answers were realistic. I also would like to do some simple project but without using too much additional hardware (eg, no readymade landline intercom) which transmits in a way that is readily available and cheap. I was thinking of having some simple FM circuit connect to the GPIO and transmit that way, with packet audio.
I am not new to rPi and have skills with soldering and basic electronics and think this would be a great project for short range (and legal) telecoms between two rPi Zero W's.
I realise also that using external FM transceivers could be extraneous and perhaps its possible to do it via built-in WiFi, saving time and money. It would require a mic and speaker thought but they are so cheap.
Any inquiring minds welcome to comment or criticise! I did do a decent search for this idea and didn't find anything that was what I was thinking about...as I mentioned earlier someone mentioned using Asterix which IMO is overkill, given the simple task required. I couldnt reply on that original query as I am new here and don't have 50 points.
PS posting a simple question on this site is difficult to do when you are new :(