GNU Gatekeeper - H.323 server for VoIP and videoconferencing
The GNU Gatekeeper can be the central server for an IP telephony (VoIP) or video conferencing network. It handles call routing, NAT traversal, call authorization and accounting. It can be extensively configured and has an API for applications.
Website: https://www.gnugk.org
Support: https://www.willamowius.com/gnugk-support.html
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