Okay, holy shit, telephony is DEAD. All solutions I found were commercial, one way or another. No true system for a selfhosting heart. I will literally have to puzzle it together using an XMPP server if I want it. Holy, fucking, shit. This is baaaaaaad o_o I looked at - but not only - these: FreePBX, FreeSWITCH, Issabel, Swyx (which we currently use), Wazo and just plain Asterisk, which most of them are based off of. And good lord... None of them have any useful or good instructions - its just rah-rah about how good their solution is - but then they run on CentOS7 ... since forever. Or Debian 10 - but have their packages behind a 'Personal Access Token' (so you make an account and they see it, didnt even bother to do so, so no idea what the KYCness is). I am somewhere between sad and pissed. Like, sure... I know that regular old phones are largely dead - but THIS dead? I had no idea. o.o...