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3G4300003G3GAAASIPTN929.5A1672-7800(2007)09-0003-0211.1IPIPXMLJavaSYMBLAN1.21.322.1AAAAAAAuthenticationAuthorizationAccountingAAAAAAAAADIAMETERRADIUSRADIUS/DIAMETERPEERTOPEERDIAMETER1972RADIUS/DI-AMETERSESSIONPEERAVPAVPProxyRelayRe-directDIAMETERDIAMETERDiameterNetworkAccessSer-verApplication,IPIPDiameterMobileIPApplicationAAA2.2SIPSIPSessionInitialProtocolHTMLUDPTCPSCTP1SIPSIPSIPSIPSIPSIPSIP:user-name@domain,sip.john@AAA.comsips:john@aaa.comSIPAORAddressofRecorduser@company.com,DNScom-pany.comSIP;FQDNFullQualifiedDomainNameuser@10.101.101.11IPSIPIPIPSIP2SIPSIP4SIPSIPSIPSIPSIP(UAC)(UAS)SIP(SIPProxyServer)(RedirectServer)SIPSIP(SIPRegisterServer)UASSIPUASUAC3SIPSIPSIPRequestre-sponseSIPSIPstart-linefieldCRLF(messagebody)messagebodyentityheaderRequest-Linestatus-linegeneral-headerrequest-headerre-sponse-headerentity-header4HTTPSDPMIMESDPapplication/SDPSDP[1].[J].,2006,(3).[2].[J].,2005,(1).[3].SIP[J].,2007,(2).DevelopmentofValue-addedBusinessin3GMobileCommunicationWANGZheng-yi(WuhanTechnicalCollegeofCommunications,Wuhan430000,China)Abstract:Thispaperexplainssomenewchangesofthebusinessvalue-addedintheeraof3Gmobilecommunications,whichareapplicationplatformchanges,businessmodelchanges,andservicechanges.Itintroducesthelatesttechnologyonthe3Gmobilecommunications,includingtwoprotocol,whichareDIAMETERofnewgenerationAAAprotocolandaccessioninitialprotocolSIP.Keyword:businessvalue-added;AAATechnology;SIPProtocol