Fax, Modem, and Text for IP Telephony
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Fax, Modem, and Text for IP Telephony

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IP Telephony has revolutionized many aspects of telecommunications and it continues to be deployed at a rapid pace. The benefits of transporting voice over an IP infrastructure include increased flexibility, better scalability, and a significant cost savings over traditional telephony networks. However, during the deployment of these VoIP solutions, other types of traditional telephony communications that can also realize these same benefits are often overlooked or ignored. Fax, Modem, and Text for IP Telephony is a comprehensive resource that confronts the need for information on transporting alternative, non-voice communications over the IP protocol. Beginning with the basic theory and operation of fax, modem, and text telephony, this book then educates you on all of the current transport options that are available. An extensive design guide then provides the pertinent advice and best practices for making the correct planning decisions and choosing the best transport option for your network. Fax, Modem, and Text for IP Telephony also includes meticulous configuration and troubleshooting guides. The configuration guides in this book include a number of sample configurations and tips to manage any fax, modem, or text deployment. The troubleshooting guides present the essential methodologies, debugs, and analysis tools for quickly resolving both the common and complex issues that may be encountered. This book is the perfect companion to other VoIP resources, and it is the only book that empowers you to successfully handle any fax, modem, or text implementation. David Hanes, CCIE (R) No. 3491, is currently a senior engineer specializing in training, network design assistance, and troubleshooting of fax technologies for the Customer Assurance Engineering (CAE) group at Cisco (R). Since joining Cisco in 1997, David has worked as a TAC engineer for the WAN, WAN Switching, and Multiservice Voice teams, a team lead for the Multiservice Voice team, and an escalation engineer covering a variety of voice and fax technologies. David has troubleshot escalated issues in Cisco customer networks worldwide and remains a technical resource for other Cisco employees and customers. Gonzalo Salgueiro CCIE No. 4541, is a senior escalation engineer supporting voice, fax, and modem technologies for the Cisco TAC. Gonzalo has spent more than 11 years troubleshooting complex issues in large-scale VoIP networks as well as providing technical leadership for some of the most critical worldwide voice and fax deployments. Prior to joining the Escalation Team in 1999 Gonzalo had roles as a TAC engineer for both the Access/Dial and Multiservice Voice teams as well as a team lead for the Access/Dial team. Learn basic and advanced operational theory and practical implementation of fax, modem, and text communications Understand how to implement fax, modem, and text communications using protocols such as H.323, SIP, MGCP, and SCCP. Explore the functionality and advantages of T.38 fax relay, passthrough, modem relay, T.37 Store-and-Forward Fax, and text relay for IP network deployments Employ expert-recommended best practices and design solutions for deploying fax, modem, and text in an IP telephony environment Optimize your network with comprehensive fax, modem, and text configuration and design tips for use with IOS and non-IOS gateways Master the latest fax, modem, and text troubleshooting tools and techniques employed by Cisco engineers Category: Cisco Press-IP CommunicationCovers: Fax, Modem, and Text Telephony Technologies for Integrated IP Networksshow more

Product details

  • Paperback | 600 pages
  • 185.42 x 231.14 x 35.56mm | 952.54g
  • Pearson Education (US)
  • Cisco Press
  • Indianapolis, United States
  • English
  • 1587052695
  • 9781587052699

About David Hanes

David Hanes, CCIE No. 3491, currently works as an engineer for the Cisco Customer Assurance Engineering (CAE) group based out of Research Triangle Park, North Carolina supporting various emerging technologies through product testing and field trials. In addition, David is a technical expert for Cisco in the area of fax over IP technologies and assists with network design and troubleshooting for critical fax over IP deployments. Since joining Cisco in 1997, he has worked as a Technical Assistance Center (TAC) engineer for the WAN, WAN Switching, and Multiservice Voice teams, a team lead for the Multiservice Voice team, and an Escalation Engineer covering a variety of voice and fax technologies. David has troubleshot escalated issues in Cisco customer networks worldwide and remains a technical resource for other Cisco employees and customers. Before working at Cisco, David was a Systems Engineer for Sprint, where he gained his first computer networking experience working on the Frame Relay and X.25 protocols. He holds a bachelor of science degree in electrical engineering from North Carolina State University. Gonzalo Salgueiro, CCIE No. 4541, is a senior engineer for the Unified Communications Infrastructure Escalation team of the Technical Assistance Center (TAC) in Research Triangle Park, North Carolina. In his current role, he is a technical leader for fax and voice over IP technologies working directly with Cisco development engineering, TAC support teams, and product serviceability organization, providing support for various Unified Communications products and technologies. Over the past 12 years at Cisco, he has specialized in troubleshooting complex issues for some of the largest VoIP networks and has provided technical leadership for some of the most critical worldwide voice and fax deployments. Before joining the Escalation team in 1999, Gonzalo had roles as a TAC engineer for both the Access/Dial and Multiservice Voice teams and as a team lead for the Access/Dial team. Gonzalo has developed and delivered all levels of training and documentation on these technologies both internally to Cisco technical teams and externally to Cisco customers worldwide. He holds a bachelor of science degree in physics from Jacksonville University and a master of science degree in physics from the University of Miami.show more

Back cover copy

IP Telephony has revolutionized many aspects of telecommunications and it continues to be deployed at a rapid pace. The benefits of transporting voice over an IP infrastructure include increased flexibility, better scalability, and a significant cost savings over traditional telephony networks. However, during the deployment of these VoIP solutions, other types of traditional telephony communications that can also realize these same benefits are often overlooked or ignored. "Fax, Modem, and Text for IP Telephony" is a comprehensive resource that confronts the need for information on transporting alternative, non-voice communications over the IP protocol. Beginning with the basic theory and operation of fax, modem, and text telephony, this book then educates you on all of the current transport options that are available. An extensive design guide then provides the pertinent advice and best practices for making the correct planning decisions and choosing the best transport option for your network. "Fax, Modem, and Text for IP Telephony" also includes meticulous configuration and troubleshooting guides. The configuration guides in this book include a number of sample configurations and tips to manage any fax, modem, or text deployment. The troubleshooting guides present the essential methodologies, debugs, and analysis tools for quickly resolving both the common and complex issues that may be encountered. This book is the perfect companion to other VoIP resources, and it is the only book that empowers you to successfully handle any fax, modem, or text implementation. David Hanes, CCIE(R) No. 3491, is currently a senior engineer specializing in training, network design assistance, and troubleshooting of fax technologies for the Customer Assurance Engineering (CAE) group at Cisco(R). Since joining Cisco in 1997, David has worked as a TAC engineer for the WAN, WAN Switching, and Multiservice Voice teams, a team lead for the Multiservice Voice team, and an escalation engineer covering a variety of voice and fax technologies. David has troubleshot escalated issues in Cisco customer networks worldwide and remains a technical resource for other Cisco employees and customers. Gonzalo Salgueiro CCIE No. 4541, is a senior escalation engineer supporting voice, fax, and modem technologies for the Cisco TAC. Gonzalo has spent more than 11 years troubleshooting complex issues in large-scale VoIP networks as well as providing technical leadership for some of the most critical worldwide voice and fax deployments. Prior to joining the Escalation Team in 1999 Gonzalo had roles as a TAC engineer for both the Access/Dial and Multiservice Voice teams as well as a team lead for the Access/Dial team. Learn basic and advanced operational theory and practical implementation of fax, modem, and text communications Understand how to implement fax, modem, and text communications using protocols such as H.323, SIP, MGCP, and SCCP. Explore the functionality and advantages of T.38 fax relay, passthrough, modem relay, T.37 Store-and-Forward Fax, and text relay for IP network deployments Employ expert-recommended best practices and design solutions for deploying fax, modem, and text in an IP telephony environment Optimize your network with comprehensive fax, modem, and text configuration and design tips for use with IOS and non-IOS gateways Master the latest fax, modem, and text troubleshooting tools and techniques employed by Cisco engineers Category: Cisco Press-IP Communication Covers: Fax, Modem, and Text Telephony Technologies for Integrated IP Networks $55.00 USA / $61.00 CANshow more

Table of contents

Introduction xxiiiPart I Laying the Groundwork 3Chapter 1 How Modems Work 5 A Brief History of Modems 5 Modem Architecture 8 Modem Types 10 External Versus Internal Modems 10 Hardware Versus Software Modems 10 Fax Modems 12 Terminal-to-Modem Communication 14 DTE and DCE 15 RS-232 Signaling 15 Asynchronous Framing 19 User Interface 20 Modem-to-Modem Communication 26 Modulation 26 Frequency Shift Keying (FSK) 28 Phase Shift Keying (PSK) 29 Amplitude Modulation (AM) 30 Quadrature Amplitude Modulation (QAM) 31 Trellis Coded Modulation (TCM) 32 Modulation Standards 33 Modem Call Analysis 34 Call Setup 35 Phase I: Network Interaction 36 Phase II: Probing/Ranging 38 Phase III: Equalizer and Echo Canceller Training 40 Phase IV: Final Training 41 Data Mode 42 Retrains and Speedshifts 42 Error Control 45 Data Compression 48 Call Disconnect 49 Summary 51Chapter 2 How Fax Works 53 A Brief History of Fax 54 Fax Components 56 Group Classifications 57 Specifications and Standards 58 Fax Modulations 59 Fax Messaging 61 Phases of a Fax Call 62 Message Format Overview 63 Analyzing a Basic Fax Call 65 CNG Tone 66 CED Tone 67 DIS, NSF, and CSI Messages 68 DCS and TSI Messages 71 TCF, CFR, and FTT Messages 73 MPS, EOP, EOM, MCF, RTP, RTN, and DCN Messages 75 Other T.30 Messages 77 Understanding Error Correction Mode 81 ECM Call Analysis 82 PPS and PPR 84 Important G3 Timers 86 Super G3 Faxing 88 Comparison of SG3 and G3 89 Super G3 Call Analysis 89 Page Encoding 91 Modified Huffman 92 Modified READ 97 Modified Modified READ 103 Summary 105Chapter 3 How Text Telephony Works 107 A Brief History of Text Telephony 107 Text Telephone Terminology 110 Standards and Specifications 110 Carrier Based Versus Carrierless Protocols 111 ITU-T Recommendation V.18 112 Text Telephone Operation 112 Acoustic Coupling Versus Direct Connections 113 Originating and Receiving Text Telephone Calls 114 Conversation Conventions 116 Text Telephone Relay Services 118 HCO (Hearing Carry Over) 119 VCO (Voice Carry Over) 120 Baudot Protocol 121 Baudot Character Set 121 Baudot Modulation Details 123 Summary 124Part II IP Solutions and Design 127Chapter 4 Passthrough 129 Passthrough Fundamentals 130 NSE-Based Passthrough 137 Fax Passthrough with NSE 139 Modem Passthrough with NSE 141 Protocol-Based Pass-Through for Fax 143 Fax Pass-Through with H.323 Signaling 144 Fax Pass-Through with SIP Signaling 145 Text over G.711 146 A Future Look at ITU-T V.152 147 Summary 148Chapter 5 Relay 151 Relay Fundamentals 151 Fax Relay 154 T.38 Fax Relay 155 NSE-Based Switchover for T.38 167 Protocol-Based Switchover for T.38 169 Cisco Fax Relay 173 Modem Relay 175 Cisco Text Relay 181 A Future Look at ITU-T T.38, V.150.1, and V.151 185 Summary 185Chapter 6 T.37 Store-and-Forward Fax 189 Overview of T.37 Store-and-Forward Fax 189 SMTP Overview 191 SMTP Commands and Sample Sessions 192 DSN and MDN 195 T.37 Onramp 201 T.37 Offramp 203 Summary 204Chapter 7 Design Guide for Fax, Modem, and Text 207 General Passthrough and Relay Design Considerations 208 Bandwidth 209 Call Control Protocol 214 QoS 215 Redundancy 221 Resource Utilization 224 Secure RTP 227 Timing and Synchronization 229 Fax Design Considerations 231 Gateway Interoperability Considerations 231 Error Correction Mode 233 Super G3 235 Hairpin Calls 237 Fallback 239 T.37 Store-and-Forward Fax 241 Fax Detect Script 243 Unified CM Integration 245 Comparing Fax Passthrough and Fax Relay 249 Modem Design Considerations 251 Comparing Modem Passthrough and Cisco Modem Relay 252 Secure Modem Relay 254 Text Design Considerations 256 Summary and Best Practices 258Chapter 8 Fax Servers 263 Fax Server Basics 264 Fax Server Integration Solutions 269 Fax Server TDM Integration with a Cisco Voice Gateway 269 Fax Server T.38 Integration with a Cisco Voice Gateway 272 Fax Server T.38 Integration with Unified CM 276 Fax Server Redundancy and Failover 281 Summary 283Part III Configuration 285Chapter 9 Configuring Passthrough 287 IOS Gateway Passthrough Configuration 288 IOS Gateway NSE-Based Passthrough Configuration 289 IOS Gateway NSE-Based Passthrough Configuration for H.323, SIP, and SCCP 289 IOS Gateway NSE-Based Passthrough Configuration for MGCP 292 IOS Gateway Protocol-Based Pass-Through Configuration 293 IOS Gateway Text over G.711 Configuration 295 6608 Catalyst Blade Passthrough Configuration 295 VG248 Passthrough Configuration 298 ATA Passthrough Configuration 303 Summary 308Chapter 10 Configuring Relay 311 IOS Gateway Relay Configuration 311 Fax Relay 312 IOS Gateway Fax Relay Configuration for H.323, SIP, and SCCP 313 IOS Gateway Fax Relay Configuration for MGCP 320 Modem Relay 325 IOS Gateway Cisco Modem Relay Configuration for H.323, SIP, and SCCP 326 IOS Gateway Cisco Modem Relay Configuration for MGCP 329 Cisco Text Relay 332 IOS Example Configurations for Relay 334 Default Fax Relay Configuration for H.323 and SIP 334 Cisco Fax Relay and Modem Passthrough Configuration for H.323 and SIP 336 T.38 Fax Relay, Cisco Modem Relay, and Cisco Text Relay Configuration for H.323andSIP 337 T.38 Fax Relay and Cisco Text Relay Configuration for SCCP 339 T.38 Fax Relay and Modem Passthrough Configuration for MGCP 340 6608 Catalyst Blade Fax Relay Configuration 342 VG248 Fax Relay Configuration 344 Summary 347Chapter 11 Configuring T.37 StoreandForward Fax 351 Enabling T.37 Store-and-Forward Fax 351 Loading the TCL Scripts 352 Configuring T.37 Onramp Fax 354 Dial-Peer Configuration for Onramp Fax 355 Fax Receive Configuration Command for Onramp Fax 360 MTA Configuration Commands for Onramp Fax 361 Sample Onramp Configuration 365 Configuring T.37 Offramp Fax 367 Dial-Peer Configuration for Offramp Fax 367 Fax Send Configuration Commands for Offramp Fax 369 MTA Configuration Commands for Offramp Fax 372 Sample Offramp Configuration 373 Summary 375Part IV Troubleshooting 377Chapter 12 Troubleshooting Passthrough and Relay 379 Attacking the Problem 380 Fundamental Troubleshooting 382 Checking the Condition of Originating and Terminating Devices 383 Testing with Voice Calls 384 Testing with PSTN Calls 385 Confirming the Configuration 386 Debugging Best Practices 387 Telephony and IP Troubleshooting 391 Call Legs in IOS Gateways 392 Viewing Call Legs 394 Modem Passthrough Call Legs 394 Fax Pass-Through Call Legs 399 Fax Relay Call Legs 400 Cisco Modem Relay Call Legs 402 Text Telephony Call Legs 404 Call Leg Troubleshooting Techniques 405 Telephony Troubleshooting 407 IP Troubleshooting 414 IP Troubleshooting for IOS Gateways 416 IP Troubleshooting for Non-IOS Gateways 419 IP Troubleshooting Using Packet Captures 424 Troubleshooting the Switchover Signaling 428 Troubleshooting NSE-Based Switchovers 430 NSE-Based Switchover for Modem Passthrough 430 NSE-Based Switchover for Cisco Modem Relay 434 NSE-Based Switchover for T.38 Fax Relay 436 Validating NSE Switchover Support 438 Troubleshooting Protocol-Based Switchovers 445 Protocol-Based Fax Pass-Through and T.38 Switchovers for H.323 446 Protocol-Based Fax Pass-Through and T.38 Switchovers for SIP 451 Protocol-Based T.38 Switchover for MGCP 455 Protocol-Based Switchovers and Unified CM 459 Troubleshooting the Cisco Fax Relay Switchover 461 Passthrough and Relay Troubleshooting 464 Troubleshooting DSP Functions 464 DSP HPI Troubleshooting 465 Loss Planning 478 Advanced Troubleshooting for Passthrough 485 Advanced Troubleshooting for Fax Relay 487 Fax Relay Data Rate 487 Dealing with Packet Loss 488 SG3 490 Debugging T.30 Fax Messaging 491 Analyzing T.38 Fax Relay Packet Captures 497 NSF/NSS 499 Handling High Delay 500 Advanced Troubleshooting for Modem Relay 503 Checking the Modem Endpoints 503 Debugging Modem Relay 505 Advanced Troubleshooting for Cisco Text Relay 506 PCM Traces for Fax and Modem 510 Capturing PCM Traces 511 Analyzing PCM Traces 515 Summary 523Chapter 13 Troubleshooting T.37 StoreandForward Fax 525 Checking the Basics 525 T.37 Onramp Troubleshooting 527 Troubleshooting the Onramp Telephony Interface 532 Troubleshooting the TIFF Image Creation 537 Troubleshooting the Onramp SMTP Connection 540 T.37 Offramp Troubleshooting 545 Troubleshooting the Offramp SMTP Connection 549 Troubleshooting the Creation of the Fax Page Image 553 Troubleshooting the Offramp Telephony Interface 556 Summary 559TOC, 1587052695, 5/20/2008show more