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1、InterworkingInternetTelephonyandWirelessTelecommunicationsNetworksJonathanLennoxKazutakaMurakamiMehmetKaraullennox@bell-labs.comkmurakami@bell-karaul@bell-labs.comlabs.comThomasF.LaPortatlp@bell-labs.comBellLaboratoriesLucentTechnologiesHolmdel,NJ07733ABSTRACTLoc
2、alInternettelephonyandmobiletelephonyarebothgrowingSwitchveryrapidly.Directlyinterworkingthetwopresentssig-ni cantadvantagesoverconnectingthemthroughaninter-mediatePSTNlink.Weproposethreenovelschemesforthemostcomplexaspectoftheinterworking:calldeliv-Callereryfrom
3、anInternettelephony(SIP)terminaltoamobileServingIntermediatetelephony(UMTS)terminal.Wethenevaluatethepropos-SwitchSwitchalsbothqualitativelyandquantitatively.However,exist-ingequipmentmaynotsupportpacketinterfacesneededforDestinationsuchinterworking.Therefore,wea
4、lsoconsidertechniquesforbackwardcompatibility,andanalyzetheirperformanceFigure1:Illustrationoftriangularroutinginmobileaswell.networks1.INTRODUCTIONTwoofthefastestgrowingareasoftelecommunicationsarewirelessmobiletelephonyandInternettelephony.Secondpectsofinterwor
5、kingmobilecommunicationsystemswithandthird-generationdigitalsystemssuchastheGlobalSys-IP-basedsystems.TheiGSMsystem[14]allowsanH.323temforMobilecommunications(GSM)[3],theUniversalterminaltoappeartotheGSMnetworkasastandardGSMMobileTelecommunicationsSystem(UMTS)[4]
6、,andwide-terminal,sothataGSMsubscribercanhavehisorhercallsbandCDMA[9]arebringingnewlevelsofperformanceandtemporarilydeliveredtoanH.323terminalratherthanacapabilitiestomobilecommunications.Meanwhile,boththemobiledevice.Severalpapers[11,12,13]describeasystemInterne
7、tEngineeringTaskForce'sSessionInitiationPro-forinterworkingGSM'sin-callhandoverprocedureswithtocol(SIP)[6]andtheInternationalTelecommunicationsH.323.However,neitheroftheseapproachessolvesthegen-Union'sH.323[8]enablevoiceandmultimediatelephoneeralinterworkingquest
8、ion:whatisthebestwayforcallstocallstobetransportedoveranInternetProtocol(IP)net-bedeliveredandroutedbetweenthetwonetworks?work.Subscriberstoeachofthesenetworks
