ITU-TH.460.21(052006)(英)MessagebroadcastforH.323systems.pdf

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1、InternationalTelecommunicationUnionITU-TH.460.21TELECOMMUNICATION(05/2006)STANDARDIZATIONSECTOROFITUSERIESH:AUDIOVISUALANDMULTIMEDIASYSTEMSInfrastructureofaudiovisualservices–SupplementaryservicesformultimediaMessagebroadcastforH.323systemsITU-TRecommendationH.460.21ITU-TH-SERIESRECOMM

2、ENDATIONSAUDIOVISUALANDMULTIMEDIASYSTEMSCHARACTERISTICSOFVISUALTELEPHONESYSTEMSH.100–H.199INFRASTRUCTUREOFAUDIOVISUALSERVICESGeneralH.200–H.219TransmissionmultiplexingandsynchronizationH.220–H.229SystemsaspectsH.230–H.239CommunicationproceduresH.240–H.259CodingofmovingvideoH.260–H.279R

3、elatedsystemsaspectsH.280–H.299SystemsandterminalequipmentforaudiovisualservicesH.300–H.349DirectoryservicesarchitectureforaudiovisualandmultimediaservicesH.350–H.359QualityofservicearchitectureforaudiovisualandmultimediaservicesH.360–H.369SupplementaryservicesformultimediaH.450–H.499M

4、OBILITYANDCOLLABORATIONPROCEDURESOverviewofMobilityandCollaboration,definitions,protocolsandproceduresH.500–H.509MobilityforH-SeriesmultimediasystemsandservicesH.510–H.519MobilemultimediacollaborationapplicationsandservicesH.520–H.529SecurityformobilemultimediasystemsandservicesH.530–H

5、.539SecurityformobilemultimediacollaborationapplicationsandservicesH.540–H.549MobilityinterworkingproceduresH.550–H.559Mobilemultimediacollaborationinter-workingproceduresH.560–H.569BROADBANDANDTRIPLE-PLAYMULTIMEDIASERVICESBroadbandmultimediaservicesoverVDSLH.610–H.619Forfurtherdetails

6、,pleaserefertothelistofITU-TRecommendations.ITU-TRecommendationH.460.21MessagebroadcastforH.323systemsSummaryThisRecommendationdefinesafeaturewhereinH.323devicesmaybroadcast(usingmulticast)amessagetooneormoreremoteH.323terminals,suchasprovidingan"intercom"functionforenterprisetelephone

7、s,a"paging"servicethroughanenterprise,oranotificationsystemtogeographicallydispersedterminals.SincethemethodutilizesstandardInternetmulticastprocedures,thefeaturemaybeusedonawidescaletoreachanynumberofH.323endpointsinageographicregionoreventheentireworld.SourceITU-TRecommendationH.46