Morning @anontor
I have now lot of work but i will study your improvments.
My main conception of this tutorial was to proof that VoIP can work in Tor.
This is chrooted configuration but if someone really need to start that kind of network, please isolate servers in virtual machines.
I prefer FreeBSD bhyve.
Also update CPU microcode against Spectre and Meltdown vulnerabilities.
I ilustrate simply setup.
172.16.0.1/10.8.0.1 OpenVPN Server bhyve VM.
172.16.0.2/10.8.0.10 OpenVPN Client with Apache bhyve VM.
172.16.0.3/10.8.0.20 OpenVPN Client with Asterisk bhyve VM.
172.16.0.4/10.8.0.30 OpenVPN Client with UnrealIRCd bhyve VM.
Setup static IP addresses in ccd directory for these servers.
I not tested but you can also start BIND DNS Server for hostnames against IP addresses.
Norbert.