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| Preface | |
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| Acknowledgments | |
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| History and Overview of Telecommunications | |
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| Public Switched Telephone Network | |
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| Structure of the Telephone Network | |
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| The Local Loop | |
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| The Central Office Switch | |
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| Components of the PSTN | |
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| Analog versus Digital Signals | |
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| Analog Signals | |
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| The Sine Wave | |
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| Digital Signals | |
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| Transmitting Analog and Digital Signals | |
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| Bandwidth versus Passband | |
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| Bandwidth in the PSTN | |
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| Harry Nyquist and Signaling Rate | |
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| Bit Rate versus Baud | |
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| The Impact of Noise on Signals | |
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| Claude Shannon's Theorem | |
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| Switching | |
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| Circuit Switching | |
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| Packet (Store-and-Forward) Switching | |
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| Connectionless versus Connection-oriented Networks | |
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| The Internet and IP Networking | |
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| OSI Network Reference Model | |
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| The Physical Layer | |
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| The Data Link Layer | |
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| The Network Layer | |
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| The Transport Layer | |
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| The Session and Presentation Layers | |
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| The Application Layer | |
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| The Importance of TCP/IP and the Internet Protocol Suite | |
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| The TCP/IP Suite | |
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| Internet Protocol (IP) | |
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| IP Addresses | |
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| Acquiring an IP Address | |
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| Dynamic Addressing | |
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| Private Addresses and the Public Network | |
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| Reliability versus Quick Delivery | |
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| Addressing the Layers | |
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| Transmission Control Protocol (TCP) | |
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| User Datagram Protocol (UDP) | |
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| Fundamentals of Packetized Voice | |
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| A Word About the Standards | |
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| A Telephone Call Simplified | |
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| Analog to Digital Conversion | |
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| Pulse Amplitude Modulation (PAM) | |
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| The Complete Digitizing Process | |
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| IP Telephony versus Traditional Telephony | |
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| Voice Quality in the Network | |
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| When Does Packetized Voice Become Telephony? | |
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| IP Telephony Protocols | |
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| H.323 Standards for Multimedia Over Packet Networks | |
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| Call Setup Using H.323 | |
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| Session Initiated Protocol (SIP) | |
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| Session Description Protocol (SDP) | |
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| Call Setup Using SIP | |
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| Comparison of H.323 and SIP | |
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| Megaco and H.248 | |
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| Megaco Terms and Definitions | |
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| The Gateway Commands | |
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| Call Setup Using Megaco/H.248 | |
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| Real-time versus Nonreal-time Traffic | |
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| Which Protocol is Needed? Which is Best? | |
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| The Lure of IP Telephony: Can It Work for Me? | |
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| Voice versus Data | |
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| The Cost of Doing Business | |
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| Telephony in the PSTN versus IP Telephony | |
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| When Does It Become IP Telephony? | |
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| Considerations for Business Evaluations | |
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| Cost Reduction | |
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| Increased Revenue | |
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| Increased Efficiency | |
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| Customer Satisfaction Improvement | |
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| Access to New Market Share/Market Segment | |
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| Provide New Service | |
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| The Silver Bullet | |
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| IP Telephony in the Enterprise | |
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| IP Telephony in the Mid-Sized Business | |
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| IP Telephony in the Small Business | |
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| Debunking Myths | |
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| Preparing to Implement an IP Telephony Solution--Planning for Success | |
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| Performance, Quality of Service, and Traffic Engineering | |
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| Quality of Service Parameters | |
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| Finding the Network Performance Envelope | |
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| Acceptable IP Telephony | |
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| Quality of Service within IP | |
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| Three QoS Philosophies for IP | |
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| Integrated Services (IntServ) | |
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| Resource Reservation Protocol | |
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| Differentiated Service (DiffServ) | |
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| Multiprotocol Label Switching (MPLS) | |
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| Where's the "Quality"? | |
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| Gigabandwidth | |
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| Gateways between Networks | |
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| Why Gateways Are Necessary | |
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| The Service Provider Basic Model | |
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| The ILEC Gateway | |
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| The ITSP Gateway | |
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| The Enterprise Model | |
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| Types of Gateways | |
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| Gateway or Softswitch? | |
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| Premise-based Telephony | |
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| Digital Subscriber Line | |
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| Cable Modems | |
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| Satellite Internet | |
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| Fixed Wireless Internet Technologies | |
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| WiFi | |
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| If We Build a High-Speed Network, Will They Come? | |
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| Work-at-Home Staff--Telecommuting | |
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| Replacing the PBX in the Office | |
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| Computer Telephony Integration (CTI) | |
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| Why Not Implement All Three? | |
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| Network-based IP Telephony Services | |
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| Traditional Centrex Service | |
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| Centrex Features | |
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| Centrex Evolves to IP Centrex | |
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| IP Centrex in the Class 5 Switch Architecture | |
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| IP Centrex in the Softswitch Architecture | |
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| Customer Premises Equipment for IP Centrex | |
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| IP Centrex Benefits | |
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| Does IP Telephony Include the Internet? | |
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| Privacy: Fact or Fiction? | |
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| Voice Over DSL/Frame/ATM--Variations on a Theme Voice over DSL (VoDSL) | |
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| Services Perspective | |
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| The Future of IP Telephony | |
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| Beefing Up IP Telephony | |
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| Industry Changes Affecting IP Telephony | |
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| Disruptive Technology Takes Center Stage | |
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| Internet Call Centers | |
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| Fax Over IP | |
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| Voice Mail over IP | |
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| IP Telephony and Denial of Service (DoS) Attacks | |
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| The Future for Equipment Vendors | |
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| The Future for Telecommunications Service Providers | |
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| The Future for Business Users | |
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| The Evolution Continues | |
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| Glossary | |
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| Resource List | |
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| Solution Vendors | |
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| Standards Organizations | |
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| Newsletters and Information Sites | |
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| General Interest URLs | |
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| Index | |