Standards supported by the GNU Gatekeeper

Here is a rough list of standards supported by the GNU Gatekeeper.

Call Signaling

  • H.323 v8
  • H.323 Annex O
  • H.245 v16
  • H.225.0 v7

Additional Features

  • H.239 Role management and additional media channels
  • H.235.1 Baseline Security Profile
  • H.235.6 Voice encryption Profile
  • H.350.x Directory Services
  • H.450.2 Call Transfer Supplementary Service
  • H.460.9 QoS Monitoring Reporting
  • H.460.17 Tunneling RAS through H.225.0
  • H.460.18 Traversal of H.323 signalling
  • H.460.19 Traversal of H.323 media
  • H.460.22 Security Profile Negotiation
  • H.460.23 Network address translator and firewall device determination
  • H.460.24 Point to point media
  • H.460.26 RTP over TCP


  • IPv4
  • IPv6
  • dual stack
  • TLS
  • RFC 3550 RTP

Audio / Video Codecs

  • GnuGk is compatible with all media codecs, incl. H.264, H.263, H.261, G.711, G.722, G.723, G.729 etc.

Last updated: 30. Oct 2016