@autumn oh yeah absolutely and most of them have 0 documentation because you're expected to have a fucking FreePBX Professional +++ Phone Dork Certified 2028 certification that costs 4k and takes two years to complete
@doskel apparently theres a bunch of consumer grade pbx stuff in europe you might wanna look into idk how expensive, compatible etc but it could be a possibility. i know that FRITZ!Boxes have that capability because I've got a few but we haven't had a home phone for years now