Last night I installed 3cx (Free Edition) Debian on a qemu instance running on a server. The install went fine. Dashboard up and running. Everything seems to be fine, however I'd like to provision the phones using Direct SIP and the option is not present. I can't find any documentation regarding enabling Direct SIP capability, nor can I find anything regarding Direct SIP not being enabled in the Free Edition. Firewall passed all checks, I've enabled use of the extension on the WAN. Is there anything else that I might have missed?