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A systematic approach to understanding the basics of voice over IPUnderstand the basics of enterprise and public telephony networking, IP networking, and how voice is transported over IP networks Learn the various caveats of converging voice and data networks Examine the basic VoIP signaling protocols (H.323, MGCP/H.248, SIP) and primary legacy voice signaling protocols (ISDN, C7/SS7) Explore how VoIP can run the same applications as the existing telephony system but in a more cost-efficient and scalable manner Delve into such VoIP topics as jitter, latency, packet loss, codecs, QoS tools, and security Voice over IP (VoIP) has become an important factor in network communications, promising lower operational costs, greater flexibility, and a variety of enhanced applications. To help you understand VoIP networks, Voice over IP Fundamentals provides a thorough introduction to the basics of VoIP.Voice over IP Fundamentals explains how a basic IP telephony infrastructure is built and works today, major concepts concerning voice and data networking, and transmission of voice over data networks. You'll learn how voice is signaled through legacy telephone networks, how IP signaling protocols are used to interoperate with current telephony systems, and how to ensure good voice quality using quality of service (QoS).Even though Voice over IP Fundamentals is written for anyone seeking to understand how to use IP to transport voice, its target audience comprises both voice and data networking professionals. In the past, professionals working in voice and data networking did not have to understand each other's roles. However, in this world of time-division multiplexing (TDM) and IP convergence, it is important to understand how these technologies work together. Voice over IP Fundamentals explains all the details so that voice experts can understand data networking and data experts can understand voice networking.The second edition of this best-selling book includes new chapters on the importance of billing and mediation in a VoIP network, security, and the common types of threats inherent when packet voice environments, public switched telephone networks (PSTN), and VoIP interoperate. It also explains enterprise and service-provider applications and services.
Contents
IntroductionPart I PSTNChapter 1 Overview of the PSTN and Comparisons to Voice over IPThe Beginning of the PSTNUnderstanding PSTN BasicsAnalog and Digital SignalingDigital Voice SignalsLocal Loops, Trunks, and Interswitch CommunicationPSTN SignalingPSTN Services and ApplicationsPSTN Numbering PlansDrivers Behind the Convergence Between Voice and Data NetworkingDrawbacks to the PSTNPacket Telephony Network DriversStandards-Based Packet Infrastructure LayerOpen Call-Control LayerVoIP Call-Control ProtocolsOpen Service Application LayerNew PSTN Network Infrastructure ModelSummaryChapter 2 Enterprise Telephony TodaySimilarities Between PSTN and ETDifferences Between PSTN and ETSignaling TreatmentAdvanced FeaturesCommon ET and PSTN InterworkingET Networks Provided by PSTNPrivate ET NetworksSummaryChapter 3 Basic Telephony SignalingSignaling OverviewAnalog and Digital SignalingDirect Current Signalin8In-Band and Out-of-Band SignalingLoop-Start and Ground-Start SignalingCAS and CCSE&M SignalingType IType IIType IIIType IVType VCASBell System MF SignalingCCITT No. 5 SignalingR1R2ISDNISDN Service5ISDN Access Interface6ISDN L2 and L3 ProtocolsBasic ISDN CallQSIGQSIG Service4QSIG Architecture and Reference PointsQSIG Protocol Stac5QSIG Basic Call Setup and Teardown ExampleDPNSSSummaryChapter 4 Signaling System 7SS7 Network ArchitectureSignaling ElementsSignaling LinksSS7 Protocol OverviewPhysical Layer-MTP L1Data Layer-MTP L2Network Layer-MTP3SCCPTUPISUPTCAPSS7 ExamplesBasic Call Setup and Teardown Example800 Database Query ExampleList of SS7 SpecificationsSummaryChapter 5 PSTN ServicesPlain Old Telephone ServiceCustom Calling FeaturesCLASS FeaturesVoice MailBusiness ServicesVirtual Private Voice NetworksCentrex ServicesCall Center ServicesService Provider ServicesDatabase ServiceOperator ServicesSummaryPart II Voice over IP TechnologyChapter 6 IP TutorialOSI Reference ModelThe Application LayerThe Presentation LayerThe Session LayerThe Transport LayerThe Network LayerThe Data Link LayerThe Physical LayerInternet ProtocolData Link Layer AddressesIP AddressingRouting ProtocolsDistance-Vector RoutingLink-State RoutingBGPIS-ISOSPFIGRPEIGRPRIPIP Transport MechanismsTCPUDPSummaryReferencesChapter 7 VoIP: An In-Depth AnalysisDelay/LatencyPropagation DelayHandling DelayQueuing DelayJitterPulse Code ModulationWhat Is PCM?A Sampling Example for Satellite NetworksVoice CompressionVoice Coding StandardsMean Opinion ScorePerceptual Speech Quality MeasurementEchoPacket LossVoice Activity DetectionDigital-to-Analog ConversionTandem EncodingTransport ProtocolsRTPReliable User Data ProtocolDial-Plan DesignEnd Office Switch Call-Flow Versus IP Phone CallSummaryReferencesChapter 8 Quality of ServiceQoS Network ToolkitEdge FunctionsBandwidth LimitationscRTPQueuingPacket ClassificationTraffic PolicingTraffic ShapingEdge QoS Wrap-UpBackbone NetworksHigh-Speed TransportCongestion AvoidanceBackbone QoS Wrap-UpRules of Thumb for QoSCisco Labs' QoS TestingSummaryChapter 9 Billing and Mediation ServicesBilling BasicsAuthentication, Authorization, and Accounting (AAA)RADIUSVendor-Specific Attributes (VSA)Billing FormatsCase Study: Cisco SIP Proxy Server and BillingRADIUS Server AccountingChallenges for VoIP NetworksMediation ServicesSummaryChapter 10 Voice SecuritySecurity RequirementsSecurity TechnologiesShared-Key ApproachesPublic-Key CryptographyProtecting Voice DevicesDisabling Unused Ports/ServicesHIPSProtecting IP Network InfrastructureSegmentationTraffic Policing802.1x Device AuthenticationLayer 2 ToolsNIPSLayer 3 ToolsSecurity Planning and PoliciesTransitive TrustVoIP Protocol-Specific IssuesComplexity TradeoffsNAT/Firewall TraversalPassword and Access ControlSummaryPart III IP Signaling ProtocolsChapter 11 H.323H.323 ElementsTerminalGatewayGatekeeperThe MCU and ElementsH.323 Proxy ServerH.323 Protocol SuiteRAS SignalingCall Control Signaling (H.225)Media Control and Transport (H.245 and RTP/RTCP)H.323 Call-FlowsSummaryChapter 12 SIPSIP OverviewFunctionality That SIP ProvidesSIP Network ElementsInteraction with Other IETF ProtocolsMessage Flow in SIP NetworkSIP Message Building BlocksSIP AddressingSIP MessagesSIP Transactions and DialogTransport Layer Protocols for SIP SignalingBasic Operation of SIPProxy Server ExampleRedirect Server ExampleB2BUA Server ExampleSIP Procedures for Registration and RoutingUser Agent Discovering SIP Servers in a NetworkSIP Registration and User MobilitySIP Message RoutingRouting of Subsequent Requests Within a SIP DialogSignaling Forking at the ProxyEnhanced Proxy RoutingSIP ExtensionsSIP Extension Negotiation Mechanism: Require, Supported, Allow HeadersCaller and Callee PreferencesSIP Event Notification Framework: Subscription and NotificationsSUBSCRIBE and NOTIFY MethodsMonitoring Registration State Using the Subscription-Notification FrameworkSIP REFER RequestPresence and Instant Messaging OverviewSIP Extensions for IM and PresenceSummaryChapter 13 Gateway Control ProtocolsMGCP OverviewMGCP ModelEndpointsConnectionsCallsMGCP Commands and MessagesCreateConnection (CRCX)ModifyConnection (MDCX)DeleteConnection (DLCX)NotificationRequest (RQNT)Notification (NTFY)AuditEndpoint (AUEP)AuditConnection (AUCX)RestartIn-Progress (RSIP)EndpointConfiguration (EPCF)MGCP Response MessagesMGCP Call FlowsBasic MGCP Call FlowTrunking GW-to-Trunking GW Call FlowAdvanced MGCP FeaturesEvents and Event PackagesDigit MapsEmbedded Notification RequestsNon-IP Bearer NetworksH.248/MEGACOSummaryPart IV VoIP Applications and ServicesChapter 14 PSTN and VoIP InterworkingCisco Packet TelephonyPacket Voice Network OverviewNetwork ElementsResidential GatewayNetwork InterfacesPGW2200 Architecture and OperationsPGW2200-Supported ProtocolsExecution EnvironmentNorth American Numbering PlanPGW2200 ImplementationApplication Check-PointingMGC Node ManagerAccountingPSTN Signaling Over IPSCTPIUAChanging Landscape of PSTN-IP InterworkingSession Border Controller (SBC)SummaryChapter 15 Service Provider VoIP Applications and ServicesThe Service Provider DilemmaService Provider Applications and BenefitsService Provider VoIP Deployment: VonageVoIP Operational AdvantagesService Provider Case Study: Prepaid Calling CardBOWIE.net Multiservice NetworksSession Border Control: Value AdditionVoIP Peering: Top Priority for the Service ProvidersService Provider VoIP and Consumer Fixed Mobile ConvergenceSummaryChapter 16 Enterprise Voice over IP Applications and ServicesMigrating to VoIP ArchitectureEnterprise Voice Applications and BenefitsAdvanced Enterprise ApplicationsWeb-Based Collaboration and ConferenceThe Need for Presence InformationPresence-Aware ServicesWi-Fi-Enabled PhonesBetter Voice Quality Using Wideband CodecsSummary1587052571 TOC 7/6/2006
