willamowius/gnugk ? reverse-engineered prompt

Build me a GNU Gatekeeper style server for a VoIP and video conferencing network.

I want it to act as the central H.323 gatekeeper, so it can manage call routing, NAT traversal, call authorization, and accounting in one place. It should be configurable from a simple settings file, support the usual server logging and runtime status I’d expect, and include a small API or hooks so other tools can integrate with it.

Please make it practical to run and test locally, with clear defaults and good error messages, and make sure it’s organized so the main gatekeeper logic, routing, authentication, and accounting pieces are easy to understand. If you need to check current H.323 or related docs online, go ahead.