ICT - Poverty Onno W. Purbo [email protected] A Common Indonesian.
H.323 Onno W. Purbo [email protected]. Referensi.. Dr. Andreas Steffen, Komunikationsysteme.
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Transcript of H.323 Onno W. Purbo [email protected]. Referensi.. Dr. Andreas Steffen, Komunikationsysteme.
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Referensi .. 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 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.
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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.
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Gatekeeper-routed call signaling.
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Direct endpoint call signaling.
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Gatekeeper-routed Control Channel.
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Direct Control Channel Connection.
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H.245 Capability Exchange
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Channel Multiplexing
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H.225.0 Channel Multiplexing
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Transport of Logical Channel
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