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H.323

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H.323 Onno W. Purbo Onno_at_indo.net.id References Dr. Andreas Steffen, Komunikationsysteme ITU-T H.323 ITU-T Multimedia Comm H.323 Network Components H.323 Gateways ... – PowerPoint PPT presentation

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Title: H.323


1
H.323
  • Onno W. Purbo
  • Onno_at_indo.net.id

2
References
  • 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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