H.323 Gatekeeper

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H.323 Gatekeeper utilities are virtual network switches, which translate network addresses and aliases to make connections via the H.323 protocol on a packet-switched network. A gatekeeper can also deny access or limit the number of simultaneous connections to prevent network congestion.

Terminals which provide multimedia content using this protocol in the H.323 "zone" (e.g. Microsoft NetMeeting) are required to register "at the gate". The registration goes into effect, once the terminal provides its address.

H323 Gatekeeper call flow.

   | |                           |  |
Endpoint A                    Endpoint B
  1234                           1123
  1. Endpoint A dials 1123 from the system.
  2. Endpoint A sends ARQ to Gatekeeper.
  3. Gatekeeper returns ACF with IP address of Endpoint B.
  4. Endpoint A sends Q.931 Call setup messages to EP B.
  5. Endpoint B sends Gatekeeper ARQ, asking if it can answer call.
  6. Gatekeeper returns ACF with IP address of EP A.
  7. Endpoint answers and sends Q.931 to EP A.
  8. IRR sent to Gatekeeper from both Endpoints.
  9. Endpoint A disconnects the call, a DRQ is sent to Gatekeeper.
  10. Gatekeeper sends to both Endpoints DCF

[edit] See also

  • GnuGK
  • Cisco IOS release version 11.3(2)NA and 12.0(3)T
  • Cisco Multimedia Conference Manager (MCM)


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