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Overview of H.323: Communication Systems and Gateway Functions

This document offers a comprehensive overview of the ITU-T H.323 standard, focusing on its architecture, including various gateway functions and gatekeeper functionalities. It delves into the physical interfaces connecting LAN and PSTN, covering call setup, release, and the translation of multiple transmission formats and codecs. Key components such as registration, admission, and status management (RAS) are also examined, highlighting automatic gatekeeper discovery and bandwidth control. Essential for understanding H.323 networks, this resource is valuable for professionals in multimedia communications.

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Overview of H.323: Communication Systems and Gateway Functions

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  1. H.323 Onno W. Purbo Onno@indo.net.id

  2. Referensi .. • Dr. Andreas Steffen, Komunikationsysteme

  3. ITU-T H.323

  4. ITU-T Multimedia Comm

  5. H.323 Network Components

  6. H.323 Gateways Functions .. • Physical Interface LAN  PSTN • POTS (analog) • ISDN (digital) • Call setup • Setup & release call both LAN & PSTN • Translation of Transmission Multiplex Formats • H.225.0 to H.221 / H.223

  7. H.323 Gateways Functions .. • Translation of System Control Protocol • H.245 to H.242 • Audio / Video Transcoding • Translation among audio codecs, conversion to analog voice. • Translation among video codecs (if terminal do not support negotiation)

  8. H.323 gatekeepers

  9. Registration, Admission and Status ..

  10. Registration, Admission and Status (RAS) • RAS defined in ITU-T H.225.0 • RAS is used between H.323 endpoint and the gatekeeper of H.323 zone they are assigned to.

  11. Automatic Gatekeeper Discovery

  12. Endpoint Registration

  13. Endpoint Unregistration

  14. Endpoint Location

  15. Endpoint Admission To Network

  16. H.323 Gatekeeper Functionality • Address Registration & Translation • RRQ/RCF/RRJ and LRQ/LCF/LRJ messages. • Translation of alias addresses to transport addresses. • Admission Control • ARQ/ACF/ARJ messages. • Authorization of LAN access (call authorization, bandwidth). • Bandwidth Control and Management • BRQ/BCF/BRJ messages. • Dynamic change of requested and available bandwidth.

  17. H.323 call setup & control

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