电信行业-无线宽频整合多媒体通讯技术( 107)

1、無線與頻寬整合之多媒體通訊技術周勝鄰 博士工研院電通所網路技術組 組長2003. 11. 26課程目的本課程將與您一同探討通訊產業中三個重要之發展趨勢 IP 電信(VoIP)逐漸成為未來通訊技術之主流, 不僅將對服務產業將發生變化, 而且也將為通訊產品產業帶來新契機;本課程將提供學員對此一領域做初步之介紹ENUM為一項非常新的技術, 它將是推動 IP/ PSTN系統與服務整合的最大動力, 同時也將對網際網路之應用產生革命性之衝擊, 為人們运用日常生活之一切通訊服務帶來莫大之便利; 本課程將對此一最新技術及其發展趨勢做深化淺出之說明WLAN 之近年來成為無線通訊之熱門話題, 各企業甚至家庭開始積

2、極建設WLAN, 此趨勢置信將持續幾年. 不過建設WLAN作何用途? Public WLAN 服務業者有無生存空間? WLAN 與 3G關係又是如何? 互補呢還是競爭?本課程最後一節將與您一同探討WLAN 與無線通訊系統之競合關係, 了解WLAN應用之發展趨勢課程大綱IP 電信技術的發展趨勢VoIP 的過去現在與未來VoIP 的技術發展從H.323 到SIPSIP 的應用與發展趨勢ENUM IP/PSTN整合之新趨勢 何謂ENUM? ENUM 服務機制WLAN 應用服務的發展趨勢WLAN 之應用WLAN 與無線通訊系統之整合通訊產業幾個重要發展趨勢VoIP 產業復甦, 有蓬勃發展趨勢IP-Ph

3、one, Wi-Fi SIP Phone, Residential Gateway, IP-PBX, 日本 Yahoo BB, J-Phone, Wireless LAN 蓬勃發展, 但服務商業方式尚待開發技術演進迅速, 公司企業, 家用Public WLAN, Cellular/WLAN 整合 ?Wireless Data (Mobile Internet) 發展不如預期Mobile Data Voice SMS, MMS, 3G 通訊系統前景不明GPRS 3G ?Cdma2000-1x vs. WCDMA ?IP 電信技術的發展趨勢Yahoo!BB VoIP Business ModelO

4、ver 1M+ BB Phone users(Dec 5th, 2002 Press Release)PSTN (NTT)DSLAMSGatewayCall Agent / Softswitch ISP / ASP(Yahoo!BB)VoIP TAVoIP TAOn-net call freeOff-net call 7.5 Yen/ 3 min.(1) Calls from PSTN(2) PSTN specific services, e.g. emergency callASDL + VoIPasThe First MilePOTS phones +PSTN phone numbersV

5、oIP 的過去Born of VoIP IndustryVoIP Phone VocalTech 1995H.323 Standard for VoIP IndustryH.323 Was Proposed by ITU-T for Multimedia Communication over LAN in 1996Adopted Quickly and Widely by Industries VoIP Gateway, Gatekeeper, Enterprise GW, IADMainly Used in Enterprise, Toll-by-Pass ApplicationsMarke

6、t Slow DownInfrastructure Bottleneck Limitation of H.323New Technologies DevelopedUsers Hesitate to Buy H.323 ProductsVendors Invest Much in H.323VoIP 的現在New Technologies ReadyMGCP, MEGACO/H.248, SCTP/M3UA, SIP/SDP,IETF-like ProtocolsNew Products DevelopedMost Upgraded from H.323 Products Support Ne

7、w Technologies as well as H.323VoIP InfrastructureSoftswitch, Trunk GW, SS7 Signaling GW (SS7 over IP)Market Re-BoomingIETF Technologies DominateSIP Telephony Being Widely AcceptedENUM for IP/PSTN Convergence Being DevelopedSoftswitch vs. SIPSoftswitch: Mainly for Class 4/5 Switch ReplacementSIP: Pr

8、ovide Telephony from IPs Point of ViewVoIP 的未來VoIP Infrastructure will Get Ready (How Soon ?)ENUM for IP/PSTN ConvergenceProduct and Service Start to BoomIts Technologies Trend, Not Just for Cost SavingDriving Force of NGNMandatory in Future All-IP NetworkSIP Technologies Will DominateSIP Telephony/

9、CO Signaling/Multimedia Service/3GKey Technologies for IP/PSTN ConvergenceTrends of VoIP TechnologiesH.323 SystemNext GenerationVoIP ProtocolsOpen Telephony ArchitectureInternet TelecomService TechnologiesMGCPMEGACO/H.248SIP/SDPSS7 over IP (SCTP)3GPP Open Service Arch.ISC SoftswitchVoIP Call Modelin

10、gAPI: Parlay, JAIN,.IP-based SCPIP-SCEPretty Amazing New Services (PANS)VoIP Technologiesfor 3G Core Network97 98 99 00 01 02 03 04 05 06Enterprise VoIP SystemsCarrier-gradeInternet Telecom. System3G All-IP CoreNetwork SystemApplicationsTechnologyComplexityVoIP Gateway/GatekeeperIP-PBXIP-PhoneSoftsw

11、itchSignaling GatewayMedia Server&Gateway(IAD, Trunk G/W)Application ServerSIP-based SystemsIP-SCPIP-SCEYearWorldTaiwanIP/PSTN ConvergencePSTNSIP ProxyENUM Service SystemSIP PhoneSIP PhoneGatewaySoftswitchApplication ServerMediaServerSIPTelephonyH.323ENUMServersOperator1Operator2SIPSIPDNSIP NetworkV

12、oIP Services ApplicationsPSTNs (Telecomm.s) Point of ViewEquip PSTN with VoIP ServicesOriginal Voice UsersFor Cost Saving, No Service EnhancementClass 4/5 Switch Replacement with SoftswitchNo Extra RevenueISPs (IPs) Point of ViewEnhance Data Network with VoIP CapabilityAdditional Voice Service to Or

13、iginal Data UsersEven Voice/Data Integrated ServicesSIP Telephony + Application/Media ServersVoIP Technologies From H.323 to SIPH.323 for VoIPHas Been Adopted by Vendors for YearsAlmost Current VoIP Products Support H.323GatewayGatekeeperTerminalMCUPacket Based NetworkN-ISDNB-ISDNH.320TerminalH.321T

14、erminalH.321TerminalH.310 terminaloperating inH.321 modeGSTNH.324TerminalH.322TerminalGuaranteedQoS LANSpeechTerminalSpeechTerminalV.70TerminalH.323MCUH.323TerminalH.323TerminalH.323TerminalH.323GatekeeperH.323GatewayPacket Based NetworkChallenges of H.323H.323 Was Originally Proposed for LAN Enviro

15、nmentLimitation Being Applied for VoIP Infrastructure ApplicationsArchitecture is Too SimpleSingle Gateway to Interact with PSTN/GSMSuitable for Peer to Peer CommunicationProtocol is Too ComplexComplicated Call Set-Up SignalingHard to ExtendSignaling Is Not EnoughOnly DTMF is SpecifiedNo SS7 Signali

16、ng CapabilityAdvanced Services are LimitedInteroperability is Still an IssueGateway DecompositionSS7SignalingTrafficMedia GW (MG)Media GW Controller (MGC)Signaling GW (SG)H.323 GWMGC:Call Control, Call Routing, Service Selection,SGInterface with SS7 and Translate to SS7 over IPMGDedicate for Media T

17、ranslation and TransportationMGCPMedia Gateway ControlSGCPTelcordiaMay 98MDCPAT&TDec 98Aug 00MEGACO/H.248IETF/ITU-TLevel3,.Aug 98IPDC 0.12IPDC 1.0Sept 98MGCP 1.0IPDC: IP Device Control ProtocolSGCP: Simple Gateway Control ProtocolMGCP: Media Gateway Control ProtocolMDCP: Media Device Control Protoco

18、lMEGACO: Media GAteway Control(IETF Working Group)MGCP/MEGACO/H.248Client-Server ArchitectureCall Agent (Media Gateway Controller)Call Control ServerMedia GatewayDedicated for Media TransmissionTrunk/Access/Residential GWsSignal GatewaySS7 InterfacingRTP StreamsSS7 (ISUP)SGWSGWSS7 (ISUP)TrunkGWTrunk

19、GWCOIP phoneAccess GW/IP-PBX/RGWIP phoneMGCPMGC(CA)MGC(CA)MGCP/MEGACOMGCP/MEGACOISUP/MGCP/SIP InterworkingSGMGCMGCSGSS7 over IPISUPTCAPSCCPMAPMTPOSI LayersApplicationPresentationSessionTransportNetworkData LinkPhysicalINAPSS7 Protocol StackISUPTCAPSCCPMAPSCN Signaling Adaptation (M3UA, IUA, )Common

20、Signaling Transport (SCTP)IPINAPSIGTRAN Protocol StackSoftswitch System ArchitectureIN/SCPPSTNLocal SwitchPSTNLocal SwitchSTPSS7 NetworkIP NetworkRTP StreamsMGCMGCTrunk GatewayTrunk GatewaySIP-TSGSGSIGTRANMegacoIP PhoneIP-PBXIP PhonePC Phone 9000Personalized VoIPService SystemBilling/Internet Messag

21、ingAuthentication/Directory/.What is A Softswitch ?Software, hardware and applications solutions typically come packaged in a single (proprietary) box.Non-standard solutions are expensive to implement and leave little room for innovation. Circuit-SwitchedTransportHardwareCall Control & SwitchingServ

22、ices & ApplicationsPROPRIETARYSolutions are open standards-based products, and can come from multiple vendors.Customers are free to choose best-in-class products to build their network. Open standards enable innovation and in the long run can reduce costsSoft-SwitchedTransport HardwareSoftswitch Cal

23、l ControlServices, Applications & Features (Management, Provisioning and Back Office)Open Protocols APIsOpen Protocols APIsWireless System From GSM to GPRSGPRSExternalDataNetworkPSTNHLRSGSNGGSNGbGnGiGSMPCUBSSGatewayMSC/VLRVisitedMSC/VLRAlways-On Wireless Packet Data ServicesIP Multimedia in 3G All-I

24、P SystemApplications& ServicesSCPTEMGWMTUTRANRUuTESGSNMTBSS/GERANRUmMGWPSTNLegacy/ExternalGGSNHSSLegacy MobileSignaling NetworkR-SGWCSCFHSSMGCFGbIuIuIuIuAT-SGWEIRMSC ServerGMSC ServerApplications& ServicesCSCFMultimediaIP NetworksMRFGnGfGcGrGiGiGiMrMsMgMwGiMmMcMcMcDCCAPCAPCAPMhCxNcNbSignaling and Da

25、ta InterfaceSignaling InterfaceAlternativeAccessNetworkSIPSIP Telephony SystemUser Agent Client(Caller)User Agent Server(Callee)Proxy ServerProxy ServerProxy ServerRedirect ServerLocation ServerSIP RequestSIP ResponseRTP Media StreamSIP AttributesUser Agents End Systems Acting on Behalf of a UserCli

26、ents(UAC) to initiate a SIP request and servers(UAS) to receive the request and return responsesServersProxy ServerRelay Call SignalingRedirect ServerRegistrar Server: User Locations Tracking (Like HLR in GSM)Naming & AddressingSIP URL, like: userhostExamplessip:patrikexamplesip:JackieSIP Operation

27、in Proxy ModeSIP Operation in Redirect ModeProtocol FormatINVITE sip:pgnexample.se SIP/2.0Via: SIP/2.0/UDP science.fictionFrom: Fingal To: Patric Call-ID: 1234567890science.fictionCseq: 1 INVITESubject: lunch at La Empenada?Content-Type: applcation/sdpContent-Length: v=0o=ffl 53655765 2353687637 IN

28、IP4 s=Chorizoc=IN IP4 science.fictionm=audio 5004 RTP/AVP 0 3 5a=rtpmap:0 PCMU/8000SIPHeaderPayload:MIME type(SDP)SIP in IP Multimedia ArchitectureApplicationsSDP/SDPngSMTPSAPSIPRTSPTCP/SCTPTCP/UDPUDPRTP/RTCPRSVPIPv4/IPv6 with Mobility, DiffServ and Multicast Common Addressing, userdomain (URI & URL

29、) Text-based and Encoding Format Same Request-Response Model, and Response Codes MIME for Flexible Payload DNS for Address MappingEasy to Do Integrated Servicesby Combining more than OneProtocolsSIP-Based ServicesInternet TelephonyWell-Recognized IP Telephony SystemInstant MessagingExchange of Conte

30、nt between Participants in Real-timePresenceSubscription to and notification of changes in the comm. State of a usersClick-to-Call from an Electronic DocumentSIP as tag Contained in DocumentTransport of MIME in SIP SignalingReference to Web/WAP Pages, mail, picturesInteractive Games with SIP Signali

31、ngRich Call with SIPBefore the CallDynamic Phone BookClick-to-TalkDuring Call EstablishmentSending a Rich Clip, which Can be A Picture with Call Subject, orSpecial Ringing ToneDuring the CallDocument SharingInformation PushDuring Session Tear-Down(same as Call Establishment)After the CallBe Able to

32、Send Instant MessageSIP for Instant MessagingIntegration of Messaging, Presence, and Session-oriented CommunicationRFC 3428 SIP Extension for Instant MessagingSIP MESSAGE Method Pager-mode IMFor small IM ExchangeCarry IM on Signaling Channel Big OverheadPager-mode vs. Session mode Instant MessagingP

33、ager-mode Each message is independent of any other messageSession-mode IMs are associated with a media session established by SIP INVITE methodMessage Session Relay Protocol (MSRP) IETF DraftSupport Session-mode IM between EndpointsSIP for IP ConvergenceIn 3G and NGN, the Focus Shift towards to All-

34、IP ParadigmIP Transport, IP Mobility and VoIP (e.g. SIP) ProtocolSIP Has Been Adopted by 3GPP for Session SignalingSIP Telephony System Has Been Well AcceptedWith SIP, Service Creation is Fast and EasyIP Protocols vs. Telecom Protocol, like INBe able to Integrate Most IP-based ServicesService Mobili

35、ty and Personal ReachabilityBy SIP and IPv6 MobilityCCL VoIP SolutionsCCL VoIP SolutionsProtocolsH.323, SGCP, MGCP/H.248, SIP, RTP/RTCP, SCTP and M3UA, Related VoIP Products Technologies and SystemsCTI / IP-PBXSoftswitch / Media Gateway ControllerSS7 over IP Signaling GatewayTrunk GatewayMedia Serve

36、r, Application ServerSIP-based Presence/Messaging ServerSIP-based IP TelephonySIP User AgentSIP Proxy ServerSIP-based Application ServerIP-PBXLAN/WLAN IP Trunking Rich PBX features Internet Call CenterACD: Automatic Call DistributionCCL IP-PBX VONTEL (cont.)Enterprise grade IP-PBXRich Call FeaturesU

37、p to 5,000 devicesBHCA: 60,000 (Busy Hour Call Attempt)Multimedia IP Call Center Solution PlatformAdvanced Skill-based Routing ACD SystemRich 3-party Call Control APISupport Voice / / Fax / and other mediaProvide both proprietary & TAPI 3.0 compatible APIsConverged Switch SystemPSTN Interworking (Me

38、gaco Interworking)SIP InterworkingH.323 InterworkingInter-Switch Call SetupCCL IP-PBX VONTEL (cont.)Media ServerVoice Play / RecordFax Send / ReceiveDTMF Generation / DetectionAdvanced Multi-party Conference(up to 8 parties / wiretap / whisper)SoftphoneFull-Feature, Intelligent SoftphonePSTN Gateway

39、Support Analog FXO InterfaceSupport T1/E1 ISDN Primary Rate InterfaceWeb-based OA&MSIP Telephony SystemIP NetworkPSTNSS7SoftswitchTrunk GatewayE1 TrunkSIP Phone(Cisco, PingTel)Web/Audio/Video ConferencingApplication/Media Server(IP Unity)User Agent(Softphone)SIP Proxy ServerOn-net CallOff-net CallUn

40、ified MessagingInstant MessagingPresenceCCL SIP Protocol and Achievements7th SIPIT, March2001 MarchMarch 2001, sponsored by ETSI at Cannes, FranceCCL SIP Protocol Stack and User Agent10th SIPIT, 2002 AprilApril 2002 , sponsored by ETSI at Cannes, FranceCCL SIP Proxy Server13th SIPIT, 2003 AugustAugu

41、st 20023 , sponsored by ETSI in CanadaCCL SIMPLE Server15th SIPIT, 2004 AugustITRI will Host 15th SIPIT Sponsored by ETSI in Taiwan in August 2004CCL SIP User AgentCCL SIP Protocol StackProvide C language APISupport RFC 2543 headersSupport RFC 2327 SDP ParsingSupport TCP and UDPSupport multi-platfor

42、m (Windows, Solaris, Linux)CCL User AgentRFC 2543 and RFC 2543bis compliantRich Call FeatureCall Forwarding, Transfer, Hold, Consultation, Support RFC 2916 ENUM (E.164 number and DNS)Support Windows platformCCL SIP Proxy ServerCCL SIP Proxy ServerRFC 2543 and RFC 2543bis compliantSupport RegisterSup

43、port RedirectSupport location serviceSupport stateful and stateless mode operationSupport parallel and sequential searchSupport RFC 2916 ENUM (E.164 number and DNS)Support multi-platform (Windows, Solaris, Linux)SIP Telephony FeaturesBasic telephony featuresBasic on-net callBasic off-net call (PSTN

44、interworking)Enhanced featuresCalling number delivery (CND)Call forwarding busy (CFB)Call forwarding dont answer (CFDA)Call waiting (CW)Selective call rejection (SCR)Auto recallApplication/Media server functionsAnnouncementVoice mailConferencingCCL Softswitch SolutionMedia Gateway ControllerSignalin

45、g GatewayPSTN10/100 Ethernet SwitchMedia ServerAnnouncementVoice MailConferencingIP NetworkIP RouterApplication ServerWeb ConferencingUnified MessagingBilling GatewayDatabase ServerElement Management ServerSS7Trunk GatewayIntegrated AccessDevicesENUM IP/PSTN整合之新趨勢Why ENUM ?How do network elements (g

46、ateways, SIP servers etc) find services on the Internet if you only have a telephone (E.164) number?How can subscribers define their preferences for incoming communications?Many Number & Addressing Mechanism UsedWith ENUM Only One NumberENUM 101What is ENUM (RFC 2916)?Make Telephone Number Become a

47、Domain Name in InternetAny Telephone Number can Register As Domain Name in IP WorldImportance of ENUMNew Addressing Mechanism in IP WorldMechanism for IP/PSTN ConvergenceGlobal ENUM ActivitiesIETF, ITU-T, US ENUM Form, Europe, ENUM Trials: More Than 10 CountriesDifferent Kinds of ENUMPublic (Persona

48、lized) ENUM: Future VisionCarrier ENUM: Enhance MMS/SMS ServicesEnterprise ENUM: Enhance Enterprise Telecomm ServiceWhat is ENUM ?ENUMMechanismE.164 NumberDomain Name System (DNS)URI(ServiceHost)ENUM is a Mechanism to Translate an E.164 Number into A List of URI (ServiceHost)So that An IP User Can b

49、e Accessed by E.164 Number.Problem: How to Address (or Locate) a User in IP World from IP/PSTN Network ?Basic Operation of ENUM“Call setupSipsip:pafciscoQuery.6.4.?Dial+4686859131DNS-ServerSip serverGatewayResponsesip:pafciscoSource: IETFENUM DomainTier-0 Top Level Domain (TLD)The Choice of Common D

50、esignated Domain fir ENUM Tier-0 is Undecided and is Proving ControversialARPA as ENUM TLD is Controlled by IETF and Operated by RIPE-NCCUS and some other countries, ISOC/IAB/IETF Support IETF ConclusionEuropean Union, France and Germany Proposed ITU-TSB as the Operator for ENUMChina, France, German

51、y, Syria and Spain Objected to ARPA as TLD for political reason to reinforce the infrastructure of Internet governanceE.A-ENUM Recommendation“Principle and procedures for the administration of E.164 Country codes for registration into the Domain Name SystemTLD is openITU-TSB is the ENUM Tier-0 Admin

52、istratorENUM DNS Hierarchy. - ns1.t1a; ns2.t1a. - ns1.t1b; ns2.t1b.- NAPTR RRs (ldap URL) LDAP DB.Tier 1Tier 2(Designated bythe end user).- ; Tier 3(Depending onthe application)6.8.8. - ns1.t1 ns2.t1Tier 0(RIPE)ns1.t1/ns2.t.- ; ns1.t1b/ns2.t1bns1.t1a/ns2.t1a/ldap URLSource: James Yum, Neustar

53、.arpa .ENUM ScenarioIP NetworkSoftswitchSIP ProxyIADENUMServer Server15Dial:03-59156162SIPPhone3309109615274User Dial . NoENUM Query, get 3 URIsMake SIP Call, No AnswerMake Mobile Call, FailConnect to DNS$ORIGIN .6.8.8. IN NAPTR 100 10 “u “sip+E2U “!.*$!sip:slchou.tw! IN NAPTR 102 10 “u “+E2U “!.*$!

54、:+886910961527! IN NAPTR 102 10 “u “mailto+E2U “!.*$!mailto:slchou.tw!Media GatewaySignal GatewayEnum RecordENUM Scenario (cont.)User Make Call to E.164 Number: 03-5915616Softswitch Translates the E.164 Number to Query Input to ENUM Server:.6.8.8. and gets a list of URIs returnedThe Softswitch Proce

55、sses the 1st URI Record,Query DNS to get the IP Address of Host: .twMake SIP Call to SIP Phone of slchou through SIP ProxySIP Phone Does not AnswerThe Softswitch Processes the 2nd URI Record,Make PSTN Call Through Gateway to 09109615270910961527 Does not AnswerThe Softswitch Processes the 3rd URI Re

56、cord,Query DNS to get the IP Address of Host: .twConnect the Caller Server SMTP ProtocolCaller Leave the MessageENUM Administration IssueTier16.8.8.RegistryTier2RegistryROOTRegistrarRegistrantAuthentication and Validation EntityASPTier2RegistryTier0 e.164 NumberAssignmentEntityRegistry vs. Registrar

57、Registry Runs the DNS server for a specific domain nameone domain - one registryRegistrarProvide ENUM Registration to ENUM UsersSo that Users Need Not to Contact RegistryRegistrar verify customer data, do billing, and send data to registry when delegation is to be done, changed or cancelledITU-T ENU

58、M ActivitiesITU-T Study Group 2Interim Procedures for Use of the ARPA DomainApproved in May, 2002Interim procedures for delegation of E.164 country codes into ARPA domain before Approval of E.A-NUMRIPE-NCC is Authorized by ITU-TSB to Perform such Delegation at this Stage/enum/instructions.htmlIETF E

59、NUM ActivitiesTelephone Number Mapping (ENUM) WGRFC 2916, “E.164 number and DNSRFC 2915, “The naming authority pointer (NAPTR) DNS resource record, August, 2000RIPE-NCC Related ENUM Activities after RFC 2916Update RFC to reference the DDDSRFC2916bis,The E.164 to URI DDDS ApplicationENUM Administrati

60、ve and Operational ProceduresRegistration and Provisioning, Validation and AuthenticationOperational Privacy, Security Issues and Procedure IETF Liaison with ITU-T SG2 New Issues Being Considered:Extent Same URI in RFC 2916 for Different Servicee.g., 2 SIP URIs but one for voice and one is instant m