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 Gatekeeper Functionality Call Authorization, Control and Management Access restrictions, upper limits on simultaneous calls. Zone Management Gatekeepers provide above services for terminals, gateways, and MCUs registered within their zone of control.

18. H.323 call setup & control Call Signaling Channel (Q.631) Q.631 call signaling channel is defined in ITU-T H.225.0. Carried over TCP port 1720. Control Channel (H.245) As part of Q.931 setup, TCP port for H.245 dynamically allocated. Destination TCP port in usually in Connect Msg called party. Negotiation of common capability.

19. Gatekeeper-routed call signaling.

20. Direct endpoint call signaling.

21. Gatekeeper-routed Control Channel.

22. Direct Control Channel Connection.

23. H.245 Capability Exchange

24. Channel Multiplexing

25. H.225.0 Channel Multiplexing

26. Transport of Logical Channel