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Awesome! I've been converting my house's existing phone lines into an intercom system, and have on my list to get a kitsch phone for each room.

woah. that's actually an awesome idea... so do you dial a room?

I'm building my own pbx though with some RPi Picos on top of some of the concepts laid out here: https://youtube.com/watch?v=BGbmFF56iH8

“Ring all rooms” is pretty easy to setup.

Or you can get asterisk and some old Cisco phones.