H.323

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H.323

• Onno W. Purbo
• Onno_at_indo.net.id

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References

• Dr. Andreas Steffen, Komunikationsysteme

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ITU-T H.323
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ITU-T Multimedia Comm
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H.323 Network Components
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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

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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)

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H.323 gatekeepers
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Registration, Admission and Status ..
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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.

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Automatic Gatekeeper Discovery
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Endpoint Registration
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Endpoint Unregistration
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Endpoint Location
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Endpoint Admission To Network
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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.

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H.323 call setup control
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