There is the passwd LDAP backend, not sure if it works for full auth though.

Som det ska vara

Is it really a problem that they want to stay faithful to the original game? You say it yourself that FIRS is available as an option for people who want something more advanced to work with, along with all the other NewGRFs.

Is it possible to just run your own SIP-trunk? We’re not intending on sending or receiving calls from external numbers outside of our little network.

What do you mean by “a block of external phone numbers?” We’d like to simply have our own internal numbers ideally, nothing to connect to the regular phone network.

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Depending on the services you provide, the usual standard ports. So if you run http/https services, port 80 and 443 respectively.

You seem to answer your own question.

Minesweeper and various solitaires, which are decent enough to pass time.