There was a similar system for minitel: these were called RTC servers. Nothing to do with WebRTC. It was short for Réseau téléphonique commuté. Basically a sim

There was a similar system for minitel: these were called RTC servers. Nothing to do with WebRTC. It was short for Réseau téléphonique commuté. Basically a simple user would run the equivalent of bbs software on his computer, but with specific tweak that it could talk in videotex encoding. And then of course he would use a modem (even in hackish ways the modem of an existing Minitel) to answer calls on a normal phone line (no x25 here). But these rarely did FIDO.