Post on 28-Dec-2015
transcript
H.323
Onno W. PurboOnno@indo.net.id
Referensi .. Dr. Andreas Steffen,
Komunikationsysteme
ITU-T H.323
ITU-T Multimedia Comm
H.323 Network Components
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
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)
H.323 gatekeepers
Registration, Admission and Status ..
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.
Automatic Gatekeeper Discovery
Endpoint Registration
Endpoint Unregistration
Endpoint Location
Endpoint Admission To Network
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.
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.
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.
Gatekeeper-routed call signaling.
Direct endpoint call signaling.
Gatekeeper-routed Control Channel.
Direct Control Channel Connection.
H.245 Capability Exchange
Channel Multiplexing
H.225.0 Channel Multiplexing
Transport of Logical Channel