H323和SIP的比较文件.docx

H323和SIP的比较文件.docx

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H323和SIP的比较文件

北电出版的关于H323和SIP的比较文件

　　TITLE:

AComparisonofH.323v4andSIP

　　DATE:

5thJanuary2000

　　SOURCE:

NortelNetworks

　　ABSTRACT:

ThiscontributioncomparesandcontrastsSIPtoH.323v4tohelpaidoperatorsandvendorsintheselectionofasingleleastcommondenominatorcontrolprotocolfortheps"domain"orperhapsmoreappropriately"plane"ofUMTSRelease2000.Theformatanticipatestheconcerns,intheformofquestions,whichmayarisefrom3GPPmembers.

　　RECOMMENDATION:

Forfacilitationofprotocolselection.

　　Note:

Everyefforthasbeenmadetoensurethecompletenessandaccuracyofthisdocument.AnyinaccuraciesordiscrepanciesareunintentionalandshouldbebroughttotheattentionofNortelNetworksforclarification/correction.

1BACKGROUND

　　1.1KEYMOTIVATORSINNETWORKPROTOCOLRECONSIDERATION:

　　1.2PROTOCOLSELECTIONOPTIONS:

　　1.3SCOPEOFTHEREQUESTEDEFFORT:

　　1.4KEYASSUMPTIONSFORTHEANALYSIS:

2H.323/SIPCOMPARISON:

IMPORTANTFACTORSTOCONSIDERWHENCHOOSINGAPROTOCOL

　　2.1COMPLEXITY

　　2.1.1Messagesetcomparison

　　2.1.2Encoding,parsingandgeneration

　　2.1.3Debugging

　　2.1.4Reuseofexistingcodeandprocedures

　　2.1.5Serviceandfeatureimplementationandprotocolinteractions

　　2.1.6Optionsandmethodsforimplementingservicesthatareavailableintheprotocol

　　2.1.7InterworkingwiththePSTN

　　2.1.8ImplementationinUMTSRelease2000networkelementsanduserdevices

　　2.2EXTENSIBILITY

　　2.2.1Compatibilityamongversions（builtintotheprotocol?

）

　　2.2.2Featureevolution

　　2.2.3Abilityforcarrierstodefineownfeaturesandservices

　　2.2.4Modularityoftheprotocoltoallowfortheeasyevolutiontonewservicesandfeatures

　　2.2.5Abilitytoworkwithexistingandnewmultimediacodecs

　　2.2.6Thirdpartycallcontrolmechanisms

　　2.3SCALABILITY

　　2.3.1Supportforlargenumbersofdomains（wideareaaddressing,userlocation,etc.）

　　2.3.2Abilitytohandlelargenumbersofcalls

　　2.3.3Maintainingofcallstates（statelessorstateful）effectonscalability

　　2.3.4Elementsthatmustmaintainstates

　　2.3.5Signalingmessageprocessing

　　2.3.6Conferencesizes,conferencecontrol（centralizedvs.distributed）

　　2.4RESOURCEUTILIZATIONANDMANAGEMENT

　　2.4.1Resourcerequiredduringthecall

　　2.4.2Resourceminimization

　　2.4.3Ifcompressionisappliedtoeachsignalingprotocol（H.323andSIP）,whatgainscouldbeachievedpercentagewise.

　　2.5SERVICES

　　2.5.1Servicessupported

　　2.5.2Delaytimestoacquireservices,bothbasic（suchasdialtoneorpost-dialdelay）andsupplementaryservices

　　2.5.3Billingandaccounting

　　2.5.4Comparisonofserviceswithexistingwirelessorwirelineservices（dothesamesetofservicesexist,notnecessarilyimplementedthesame）.352.5.5Capabilitiesexchangeservicesprovidedintheprotocol

　　2.5.6Personalmobilityservices（deliveryofserviceswhereverthesubscriberislocated,networkindependent）andlocationbasedservices362.5.7Interworkingandinteroperabilitywithlegacynetworks（wirelineandwireless）

　　2.5.8InterworkingandinteroperabilitywithotherIPcallcontrolprotocols（e.g.,cable）

　　2.5.9Securityservicesprovided,authenticationofusersandnetworkelements,dataprivacyandencipherment

　　2.6WIRELESSSTANDARDSCONSIDERATION

　　2.6.1Whereandhowwouldanywirelessspecificchangestotheprotocolbeimplemented?

　　2.7OA&M402.7.1WhatOA&Mproceduresareavailable?

　　2.7.2Whatleveloffaultdetectionandmonitoringareavailable?

3H.323/SIPCOMPARISONQUESTIONS

　　3.1DESCRIBEANDCOMPARETHEPURPOSEANDINTENTOFTHEH.323ANDSIPPROTOCOLS.CONSIDERWHYTHEYWEREDEVELOPED,WHATNETWORKSTHEYWEREDEVELOPEDFOR,WHATSERVICESTHEYWEREINTENDEDTOSUPPORT/PROVIDE,ETC.

　　3.1.1H.323

　　3.1.2SIP423.1.3Conclusion:

　　3.2DESCRIBEANDCOMPARETHESTATUSOFTHEH.323-SERIESPROTOCOLSTANDARDIZATIONANDTHESIPPROTOCOL,INTERMSOFAVAILABILITYANDMATURITYOFSTANDARDSFORPRODUCTDEVELOPMENT.

　　3.3WHATSTANDARDSCHANGESAREENVISIONEDTOH.323,ANDASSOCIATEDSTANDARDS,TOSUPPORTTHEUMTSRELEASE2000ARCHITECTURE?

WHATSTANDARDSCHANGESAREENVISIONEDTOSIP,ANDASSOCIATEDSTANDARDS,TOSUPPORTTHEUMTSRELEASE2000ARCHITECTURE?

WHATISTHEESTIMATEDDEVELOPMENTTIMEFORANDAVAILABILITYEACHOFTHESESTANDARDS?

COMPARETHESTANDARDSPROCESSFORH.323ANDSIP.

　　3.4DESCRIBEANDCOMPARETHEOVERALLCOMPLEXITYOFIMPLEMENTINGTHEH.323ANDASSOCIATEDMULTIMEDIACONTROLPROTOCOLS,ANDTHESIPPROTOCOL.

　　3.5DESCRIBEANDCOMPARETHECOMPLEXITYOFIMPLEMENTINGH.323ANDASSOCIATEDPROTOCOLS,ANDTHESIPPROTOCOL,INTHEUMTSRELEASE2000ARCHITECTURE.

　　3.6HOWWIDESPREADDOYOUENVISIONH.323DEPLOYMENTINTOOTHERACCESSTECHNOLOGIES,SUCHASINTERNETTELEPHONYANDCABLE?

HOWWIDESPREADDOYOUENVISIONSIPDEPLOYMENTINTOOTHERACCESSTECHNOLOGIES,SUCHASINTERNETTELEPHONYANDCABLE?

　　3.7DESCRIBEIMPLEMENTATIONBENEFITSORCHALLENGESFACEDWITHH.323'SBINARYREPRESENTATIONOFMESSAGES,BASEDONASN.1ANDPACKEDENCODINGRULES.INCLUDECONSIDERATIONSFORINTEROPERABILITY,REUSE,ETC.DESCRIBEIMPLEMENTATIONBENEFITSORCHALLENGESFACEDWITHSIP'STEXTENCODINGOFMESSAGES,SIMILARTOHTTPANDRTSP.INCLUDECONSIDERATIONSFORINTEROPERABILITY,REUSE,ETC.COMPARETHEBENEFITSANDCHALLENGESOFTHEENCODINGOFTHEH.323PROTOCOLANDTHESIPPROTOCOL.

　　3.8DESCRIBEANDCOMPAREH.323'SANDSIP'SSUPPORTFORDISTRIBUTEDCALLSIGNALINGANDRESOURCEMANAGEMENT.473.9DISCUSSANDCOMPARETHEINTEROPERABILITYOFANH.323-BASEDUMTSRELEASE2000NETWORKANDASIP-BASEDUMTSRELEASE2000NETWORKWITHTHEEXISTINGNETWORKS（WIRELESSANDWIRELINE）.IDENTIFYANDCOMPARECOMPLEXITIESWITHTHEINTERWORKINGTHATMIGHTBEPRESENTUSINGH.323ANDSIP（I.E.,GATEWAYCOMPLEXITY）.

　　3.10DESCRIBEANDCOMPARETHEBASICSETOFSERVICESTHATWOULDBESUPPLIEDINAUMTSRELEASE2000NETWORKWITHH.323ANDSIPIMPLEMENTATION.HOWWOULDADDITIONALSERVICESBEADDEDFOR:

CARRIERDEFINED,THIRDPARTYDEFINED,ANDSTANDARDSDEFINEDSERVICES?

HOWARETRIGGERPOINTSDEFINED?

WHEREARETHESERVICESSUPPORTED,VISITEDORHOMENETWORK?

　　3.11DESCRIBEANDCOMPARETHEOAM&PSERVICESTHATWOULDBESUPPORTEDINAUMTSRELEASE2000WITHH.323ANDSIPIMPLEMENTATION.

　　3.12DISCUSSANDCOMPAREHOWACCOUNTINGANDBILLINGWOULDBEPERFORMEDINTHEUMTSRELEASE2000NETWORKWITHH.323ANDSIP.

　　3.13ASSUMINGFIRMSTANDARDSTEXTEXISTSFORANH.323IMPLEMENTATIONINTHEUMTSRELEASE2000ARCHITECTUREBY4Q00,ISITPOSSIBLETOHAVEGENERALAVAILABILITYOFANUMTSRELEASE2000NETWORKWITHH.323MULTIMEDIACALLCONTROLSOLUTIONDEPLOYEDBYTHEENDOF2Q2001WITHTHISARCHITECTURE?

　　3.14ASSUMINGFIRMSTANDARDSTEXTEXISTSFORANSIPIMPLEMENTATIONINTHEUMTSRELEASE2000ARCHITECTUREBY4Q00,ISITPOSSIBLETOHAVEGENERALAVAILABILITYOFANUMTSRELEASE2000NETWORKWITHSIPMULTIMEDIACALLCONTROLSOLUTIONDEPLOYEDBYTHEENDOF2Q2001WITHTHISARCHITECTURE?

　　3.15PLEASEIDENTIFYWHICH,IFANY,OFTHEUMTSRELEASE2000DEFINEDINTERFACESYOUBELIEVEWILLBEPROPRIETARYAVAILABLEIN2Q2001.

　　3.16DESCRIBEANYALTERNATEMEANSOFSTAGINGDEPLOYMENTOFFUNCTIONTOFACILITATETHEINTRODUCTIONFORTHISARCHITECTURE.

　　3.17DESCRIBEANDCOMPAREHOWASUBSCRIBEROBTAINSACONSISTENTANDFULLSETOFSERVICES,NOMATTERWHATNETWORKTHEYMAYBELOCATEDIN,USINGTHEUMTSRELEASE2000ARCHITECTUREWITHH.323ANDSIPSIGNALING.SPECIFICALLYADDRESSWHICHNETWORKELEMENTSINBOTHTHEVISITEDANDHOMENETWORKSWOULDBEINVOLVEDANDREQUIRESIGNALINGINTERACTION,WHATELEMENTCONTROLSBEARERRESOURCES,ETC.

　　3.18FORTHEPURPOSEOFHIGHLIGHTINGANDCOMPARINGTHESIGNALINGCOMPLEXITIES,PROVIDEEXAMPLECALLFLOWSUSINGBOTHH.323ANDSIPSIGNALINGANDTHEUMTSRELEASE2000ARCHITECTURETOSUPPORTONEORMOREOFTHEFOLLOWINGSERVICES:

513.18.1Mobileoriginatedcalltoalandlinephone513.18.2Mobileoriginatedcalltoamobilephone

　　3.18.3Mobileterminatedcallfromalandlinephone533.18.4Mobileterminatedcallfromamobilephone

　　3.18.5Mobilepartyaddinginathirdparty（landline）inanexistingmobiletolandlineconnectedcall

　　3.18.6Landlinepartyaddinginathirdparty（mobileonUMTSRelease2000network）inanexistinglandlinetolandlineconnectedcall

　　3.18.7Mobileterminatedcallfromalandlinephone,mobilebusy,forwardedtovoicemail

　　3.18.8Mobileterminatedcallfromalandlinephone,noanswer,forwardedtosubscriberdefinedmobilephone

　　3.18.9MobileoriginatedcallwhileroaminginanotherUMTSRelease2000network

　　3.18.10MobileterminatedcallwhileroaminginanotherUMTSRelease2000network

　　3.18.11Mobileoriginatedcallwhileroaminginanother3GPPnetwork

　　3.18.12Mobileterminatedcallwhileroaminginanother3GPPnetwork

　　3.18.13SIMroamingintoaUMTSRelease2000network

　　3.19DESCRIBEANDCOMPARETHESECURITYMECHANISMSINPLACEWITHH.323ANDSIP,ANDHOWTHESEMECHANISMSMEETOPERATORREQUIREMENTSFORFRAUDMITIGATIONANDEND-USERPRIVACY.

　　3.20EXPLAINHOWTHEUMTSRELEASE2000ARCHITECTUREWITHTHEH.323ANDSIPPROTOCOLSSUPPORTREGULATORYSERVICES,SUCHASLAWFULSURVEILLANCEANDEMERGENCYSERVICES（INCLUDINGLOCATION）.713.21RECOMMENDATION

　　3.21.1CONCLUSION

　　3.22REFERENCES74

1Background

TwostandardshaveemergedforsignalingandcontrolofVoIPtelephony:

ITU-TH.323andtheIETFSessionInitiatedProtocol（SIP）.Theseprotocols,althoughresultinginthesameend-userservice（telephony）,differintheapproachtoprovidingsignalingfunctions.H.323isbasedmoreonamonolithicblocderivedfromH.320fortraditionalofthetraditionalcircuit-switchedISDNmultimedia,andSIPfavorsamorelightweightapproachbasedon