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OpenH323 Gatekeeper – Basis for Free VOIP

The GNU Gatekeeper (GnuGk) is a full featured H.323 gatekeeper, available freely under GPL license. It forms the basis for a free IP telephony system (VOIP).

It is being used commercially by many organizations to provide VOIP services.

  • Executables for Linux, Windows, MacOS X, Solaris, FreeBSD, OpenBSD and NetBSD
  • can be run as a Windows service
  • 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
  • full H.323 proxy
  • TCP interface to applications
  • CTI functions (eg. VOIP call-center, call transfers)
  • gatekeeper clustering support (neighbors, parent/child, alternates)
  • H.235 security
  • graphical user interface
  • it’s free, including source code


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