book

Fax, Modem, and Text for IP Telephony

Name: Fax, Modem, and Text for IP Telephony
ISBN: 9781587057618

by David CCIE No. 3491 Hanes, Gonzalo CCIE No. 4541 Salgueiro

June 2008

Intermediate to advanced

600 pages

15h 10m

English

Cisco Press

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Copyright
Dedications
About the Authors
About the Technical Reviewers
Acknowledgments
Icons Used in This Book
Command Syntax Conventions
Introduction
Target Release: Cisco IOS Software Version 12.4(9)T1Goals and MethodsWho Should Read This Book?
How This Book Is Organized
Comments for the AuthorsFurther ReadingCisco.comVoice over IP Fundamentals, Second EditionTroubleshooting Cisco IP Telephony
I. Laying the Groundwork
1. How Modems Work
A Brief History of ModemsModem ArchitectureModem TypesExternal Versus Internal ModemsHardware Versus Software ModemsFax ModemsTerminal-to-Modem CommunicationDTE and DCERS-232 SignalingAsynchronous FramingUser InterfaceModem-to-Modem CommunicationModulationFrequency Shift Keying (FSK)Phase Shift Keying (PSK)Amplitude Modulation (AM)Quadrature Amplitude Modulation (QAM)Trellis Coded Modulation (TCM)Modulation StandardsModem Call AnalysisCall SetupPhase I: Network InteractionPhase II: Probing/RangingPhase III: Equalizer and Echo Canceller TrainingPhase IV: Final TrainingData ModeRetrains and SpeedshiftsError ControlData CompressionCall DisconnectSummary

2. How Fax Works
A Brief History of FaxFax ComponentsGroup ClassificationsSpecifications and StandardsFax ModulationsFax MessagingPhases of a Fax CallMessage Format OverviewAnalyzing a Basic Fax CallCNG ToneCED ToneDIS, NSF, and CSI MessagesDCS and TSI MessagesTCF, CFR, and FTT MessagesMPS, EOP, EOM, MCF, RTP, RTN, and DCN MessagesOther T.30 MessagesUnderstanding Error Correction ModeECM Call AnalysisPPS and PPRImportant G3 TimersSuper G3 FaxingComparison of SG3 and G3Super G3 Call AnalysisPage EncodingModified HuffmanModified READModified Modified READSummary
3. How Text Telephony Works
A Brief History of Text TelephonyText Telephone TerminologyStandards and SpecificationsCarrier Based Versus Carrierless ProtocolsITU-T Recommendation V.18Text Telephone OperationAcoustic Coupling Versus Direct ConnectionsOriginating and Receiving Text Telephone CallsConversation ConventionsText Telephone Relay ServicesHCO (Hearing Carry Over)VCO (Voice Carry Over)Baudot ProtocolBaudot Character SetBaudot Modulation DetailsSummary
II. IP Solutions and Design
4. Passthrough
Passthrough FundamentalsNSE-Based PassthroughFax Passthrough with NSEModem Passthrough with NSEProtocol-Based Pass-Through for FaxFax Pass-Through with H.323 SignalingFax Pass-Through with SIP SignalingText over G.711A Future Look at ITU-T V.152Summary
5. Relay
Relay FundamentalsFax RelayT.38 Fax RelayNSE-Based Switchover for T.38Protocol-Based Switchover for T.38Cisco Fax RelayModem RelayCisco Text RelayA Future Look at ITU-T T.38, V.150.1, and V.151Summary
6. T.37 Store-and-Forward Fax
Overview of T.37 Store-and-Forward FaxSMTP OverviewSMTP Commands and Sample SessionsDSN and MDNT.37 OnrampT.37 OfframpSummary
7. Design Guide for Fax, Modem, and Text
General Passthrough and Relay Design ConsiderationsBandwidthCall Control ProtocolQoSRedundancyResource UtilizationSecure RTPTiming and SynchronizationFax Design ConsiderationsGateway Interoperability ConsiderationsError Correction ModeSuper G3Hairpin CallsFallbackT.37 Store-and-Forward FaxFax Detect ScriptUnified CM IntegrationComparing Fax Passthrough and Fax RelayModem Design ConsiderationsComparing Modem Passthrough and Cisco Modem RelaySecure Modem RelayText Design ConsiderationsSummary and Best Practices
8. Fax Servers
Fax Server BasicsFax Server Integration SolutionsFax Server TDM Integration with a Cisco Voice GatewayFax Server T.38 Integration with a Cisco Voice GatewayFax Server T.38 Integration with Unified CMFax Server Redundancy and FailoverSummary
III. Configuration
9. Configuring Passthrough
IOS Gateway Passthrough ConfigurationIOS Gateway NSE-Based Passthrough ConfigurationIOS Gateway NSE-Based Passthrough Configuration for H.323, SIP, and SCCPIOS Gateway NSE-Based Passthrough Configuration for MGCPIOS Gateway Protocol-Based Pass-Through ConfigurationIOS Gateway Text over G.711 Configuration6608 Catalyst Blade Passthrough ConfigurationVG248 Passthrough ConfigurationATA Passthrough ConfigurationSummary
10. Configuring Relay
IOS Gateway Relay ConfigurationFax RelayIOS Gateway Fax Relay Configuration for H.323, SIP, and SCCPIOS Gateway Fax Relay Configuration for MGCPModem RelayIOS Gateway Cisco Modem Relay Configuration for H.323, SIP, and SCCPIOS Gateway Cisco Modem Relay Configuration for MGCPCisco Text RelayIOS Example Configurations for RelayDefault Fax Relay Configuration for H.323 and SIPCisco Fax Relay and Modem Passthrough Configuration for H.323 and SIPT.38 Fax Relay, Cisco Modem Relay, and Cisco Text Relay Configuration for H.323 and SIPT.38 Fax Relay and Cisco Text Relay Configuration for SCCPT.38 Fax Relay and Modem Passthrough Configuration for MGCP6608 Catalyst Blade Fax Relay ConfigurationVG248 Fax Relay ConfigurationSummary
11. Configuring T.37 Store-and-Forward Fax
Enabling T.37 Store-and-Forward FaxLoading the TCL ScriptsConfiguring T.37 Onramp FaxDial-Peer Configuration for Onramp FaxFax Receive Configuration Command for Onramp FaxMTA Configuration Commands for Onramp FaxSample Onramp ConfigurationConfiguring T.37 Offramp FaxDial-Peer Configuration for Offramp FaxFax Send Configuration Commands for Offramp FaxMTA Configuration Commands for Offramp FaxSample Offramp ConfigurationSummary
IV. Troubleshooting
12. Troubleshooting Passthrough and Relay
Attacking the ProblemFundamental TroubleshootingChecking the Condition of Originating and Terminating DevicesTesting with Voice CallsTesting with PSTN CallsConfirming the ConfigurationDebugging Best PracticesTelephony and IP TroubleshootingCall Legs in IOS GatewaysViewing Call LegsModem Passthrough Call LegsFax Pass-Through Call LegsFax Relay Call LegsCisco Modem Relay Call LegsText Telephony Call LegsCall Leg Troubleshooting TechniquesTelephony TroubleshootingIP TroubleshootingIP Troubleshooting for IOS GatewaysIP Troubleshooting for Non-IOS GatewaysIP Troubleshooting Using Packet CapturesTroubleshooting the Switchover SignalingTroubleshooting NSE-Based SwitchoversNSE-Based Switchover for Modem PassthroughNSE-Based Switchover for Cisco Modem RelayNSE-Based Switchover for T.38 Fax RelayValidating NSE Switchover SupportTroubleshooting Protocol-Based SwitchoversProtocol-Based Fax Pass-Through and T.38 Switchovers for H.323Protocol-Based Fax Pass-Through and T.38 Switchovers for SIPProtocol-Based T.38 Switchover for MGCPProtocol-Based Switchovers and Unified CMTroubleshooting the Cisco Fax Relay SwitchoverPassthrough and Relay TroubleshootingTroubleshooting DSP FunctionsDSP HPI TroubleshootingHPI Debugs for Fax RelayHPI Debugs for Cisco Modem RelayHPI Debugs for PassthroughLoss PlanningAdvanced Troubleshooting for PassthroughAdvanced Troubleshooting for Fax RelayFax Relay Data RateDealing with Packet LossSG3Debugging T.30 Fax MessagingAnalyzing T.38 Fax Relay Packet CapturesNSF/NSSHandling High DelayAdvanced Troubleshooting for Modem RelayChecking the Modem EndpointsDebugging Modem RelayAdvanced Troubleshooting for Cisco Text RelayPCM Traces for Fax and ModemCapturing PCM TracesCisco PCM Capture ToolPacket Capture PCM ExtractionThird-Party Test ToolsAnalyzing PCM TracesFax Call PCM Trace AnalysisModem Call PCM Trace AnalysisSummary
13. Troubleshooting T.37 Store-and-Forward Fax
Checking the BasicsT.37 Onramp TroubleshootingTroubleshooting the Onramp Telephony InterfaceTroubleshooting the TIFF Image CreationTroubleshooting the Onramp SMTP ConnectionT.37 Offramp TroubleshootingTroubleshooting the Offramp SMTP ConnectionTroubleshooting the Creation of the Fax Page ImageTroubleshooting the Offramp Telephony InterfaceSummary

Content preview from Fax, Modem, and Text for IP Telephony

Acknowledgments

David Hanes: First, I would like to thank Gonzalo Salgueiro for co-authoring this book with me. I can honestly say that this book would never have happened without him. Gonzalo’s diligence in ensuring that this book achieved the highest level of excellence and accuracy was unparalleled. His meticulous attention to detail and long hours late at night working in the lab and reviewing chapters required many sacrifices and time away from his family. In addition to being my co-author in the writing of this book, Gonzalo is also a great friend. For his tireless dedication and countless hours spent on this book, I will always be appreciative.

Thanks to Anne Smith for being my guide and mentor throughout this book writing process. What ...

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Fax, Modem, and Text for IP Telephony

by David CCIE No. 3491 Hanes, Gonzalo CCIE No. 4541 Salgueiro

Acknowledgments

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