GNU Gatekeeper – H.323 gatekeeper

GNU Gatekeeper (GnuGk) is a feature-rich, open-source project that implements an H.323 gatekeeper. H.323 is a communications standard for audio, video, and data over the Internet.

A H.323 gatekeeper controls all H.323 clients (endpoints like MS Netmeeting) in his zone. Its most important function is address translation between symbolic alias addresses and IP addresses. This way you can call someone instead of knowing which IP address s/he currently works on. It is an integral part of most useful internet telephony installations that are based on the H.323 standard.

This software allows users, among other things, to register devices, make calls, perform AAA (Authentication, Authorization and Auditing), manage config at runtime and traverse NAT.

Features include:

  • Graphical user interface.
  • Accounting and call authorization via SQL database, Radius, file or external application.
  • Database drivers for ODBC, MySQL, PostreSQL, SQLite and Firebird.
  • Flexible call routing.
  • Number rewriting (calling and called).
  • Support for NAT traversal ((H.460.17, H.460.18, H.460.19, H.460.23 and H.460.24).
  • Language based routing using H.235 security (password authentication and H.235.6 media encryption)
  • Full H.323 proxy.
  • TCP interface to applications.
  • CTI functions (eg. VOIP call-center, call transfers).
  • Flexible call routing.
  • Gatekeeper clustering support (neighbors, parent/child, alternates).
  • H.235 security.
  • H.460.18 and H.460.19 support.
  • Full IPv6 support (including IPv4-IPv6 conversion).
  • Full traversal zone support (gatekeeper-to-gatekeeper H.460.18 / H.460.19).
  • RTP multiplexing (all calls to and from devices supporting H.460.19 will only use 2 sockets total).
  • Improved H.235 password authentication with neighbours.
  • LDAP / ActiveDirectory support (H.350 or free form schema)
  • Notifications when GnuGk opens listen ports.
  • Detailed information about ongoing calls: You can now display lots ofinformation about each ongoing call (codecs, bandwidth used, IPs etc.).
  • Cross-platform support. The gatekeeper runs on Linux, MacOS X, Solaris, FreeBSD, OpenBSD, and NetBSD.

Website: www.gnugk.org
Support: Manual, Blog, FAQ, Mailing List
Developer: Jan Willamowius, Chih-Wei Huang, Citron Network Inc, and contributors
License: GNU GPL v2

GnuGk is written in C++. Learn C++ with our recommended free books and free tutorials.

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