[culanuchachamim]

This is a old and very known technology: https://www.google.com/search?q=data+over+sound&oq=data+over...

I once worked with a company that have a whole business around this technology (for some reason their website isn't working): https://il.linkedin.com/company/sonarax

[blitzar]

I was sure this was a thing on a browser not long ago ... 2015 chrome is what I was thinking of - a severless send to phone method I guess https://www.independent.co.uk/tech/google-tone-chrome-extens...

[jbverschoor]

Yeah, it's called a dial up modem ;-)