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IP Telephony Demystified / Edition 1
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IP Telephony Demystified / Edition 1

4.6 5
by Ken Camp

ISBN-10: 0071406700

ISBN-13: 9780071406703

Pub. Date: 10/25/2002

Publisher: McGraw-Hill Professional Publishing

“Focused on why the reader should care about a particular technology, and what the reader can gain from it.” -- Steven Shepard, author of Telecommunications Convergence, now in its Second Edition


With a potential 90 percent reduction in phone costs, voice over data networks


“Focused on why the reader should care about a particular technology, and what the reader can gain from it.” -- Steven Shepard, author of Telecommunications Convergence, now in its Second Edition


With a potential 90 percent reduction in phone costs, voice over data networks could offer your business substantial benefits. But how do you know if telephone over IP (Internet Protocol) suits your needs and setup? And if it does, what will it take to make it work? If you want straightforward answers to these questions, you’ve come to the right place. Lighting the way to IP telephony is Ken Camp’s specialty, and in IP Telephony Demystified he offers the best set of tools out there for making basic get-going decisions.

You must read this book if—

* you’re on IT staff or in management of a small business and investigating voice over data lines

* escaping from the telephone companies’ clutches sounds appealing

* the economies of voice and data on the same network are obvious

* the no-go or go decision on IP telephony is your assignment

* what's-in-it-for-my-company questions are uppermost in your mind

* direct, measurable benefits is an important item in your agenda

* choosing the right protocol might be a job-saver

* before wrestling SIP, H.323, or Megaco/H.248, you want to know if the match is worth the prize

* practical how-to's on integrating voice into your LAN could reduce your workload

* you'd rather have quality-of-service (QoS) answers--on IntServ, Diff Serv, and MPLS--than quality-of-service concerns

* a 3D view of cost and service implications is what you seek

IP telephony is simply voice sent over an IP network like the Internet. It can mean enormous savings--but not for every business. This is the book that will clarify whether it's right for your company, and if so, how to make it work.

Product Details

McGraw-Hill Professional Publishing
Publication date:
Demystified Series
Product dimensions:
7.30(w) x 9.00(h) x 0.74(d)

Table of Contents

Chapter 1History and Overview of Telecommunications1
Public Switched Telephone Network3
Structure of the Telephone Network5
The Local Loop6
The Central Office Switch7
Components of the PSTN7
Analog versus Digital Signals9
Analog Signals9
The Sine Wave10
Digital Signals11
Transmitting Analog and Digital Signals11
Bandwidth versus Passband12
Bandwidth in the PSTN14
Harry Nyquist and Signaling Rate14
Bit Rate versus Baud15
The Impact of Noise on Signals15
Claude Shannon's Theorem16
Circuit Switching17
Packet (Store-and-Forward) Switching19
Connectionless versus Connection-oriented Networks20
Chapter 2The Internet and IP Networking23
OSI Network Reference Model24
The Physical Layer25
The Data Link Layer26
The Network Layer26
The Transport Layer27
The Session and Presentation Layers28
The Application Layer28
The Importance of TCP/IP and the Internet Protocol Suite28
The TCP/IP Suite29
Internet Protocol (IP)30
IP Addresses34
Acquiring an IP Address37
Dynamic Addressing38
Private Addresses and the Public Network40
Reliability versus Quick Delivery41
Addressing the Layers42
Transmission Control Protocol (TCP)45
User Datagram Protocol (UDP)49
Chapter 3Fundamentals of Packetized Voice53
A Word About the Standards54
A Telephone Call Simplified56
Analog to Digital Conversion57
Pulse Amplitude Modulation (PAM)58
The Complete Digitizing Process61
IP Telephony versus Traditional Telephony62
Voice Quality in the Network64
When Does Packetized Voice Become Telephony?67
Chapter 4IP Telephony Protocols71
H.323 Standards for Multimedia Over Packet Networks74
Call Setup Using H.32377
Session Initiated Protocol (SIP)80
Session Description Protocol (SDP)82
Call Setup Using SIP83
Comparison of H.323 and SIP85
Megaco and H.24886
Megaco Terms and Definitions89
The Gateway Commands89
Call Setup Using Megaco/H.24892
Real-time versus Nonreal-time Traffic94
Which Protocol is Needed? Which is Best?94
Chapter 5The Lure of IP Telephony: Can It Work for Me?97
Voice versus Data98
The Cost of Doing Business99
Telephony in the PSTN versus IP Telephony101
When Does It Become IP Telephony?104
Considerations for Business Evaluations106
Cost Reduction106
Increased Revenue107
Increased Efficiency107
Customer Satisfaction Improvement108
Access to New Market Share/Market Segment108
Provide New Service108
The Silver Bullet109
IP Telephony in the Enterprise111
IP Telephony in the Mid-Sized Business113
IP Telephony in the Small Business115
Debunking Myths116
Preparing to Implement an IP Telephony Solution--Planning for Success117
Chapter 6Performance, Quality of Service, and Traffic Engineering121
Quality of Service Parameters124
Finding the Network Performance Envelope127
Acceptable IP Telephony131
Quality of Service within IP131
Three QoS Philosophies for IP133
Integrated Services (IntServ)134
Resource Reservation Protocol135
Differentiated Service (DiffServ)138
Multiprotocol Label Switching (MPLS)139
Where's the "Quality"?142
Chapter 7Gateways between Networks145
Why Gateways Are Necessary146
The Service Provider Basic Model147
The ILEC Gateway148
The ITSP Gateway149
The Enterprise Model152
Types of Gateways155
Gateway or Softswitch?156
Chapter 8Premise-based Telephony161
Digital Subscriber Line165
Cable Modems169
Satellite Internet171
Fixed Wireless Internet Technologies173
If We Build a High-Speed Network, Will They Come?176
Work-at-Home Staff--Telecommuting177
Replacing the PBX in the Office179
Computer Telephony Integration (CTI)184
Why Not Implement All Three?186
Chapter 9Network-based IP Telephony Services187
Traditional Centrex Service189
Centrex Features190
Centrex Evolves to IP Centrex193
IP Centrex in the Class 5 Switch Architecture194
IP Centrex in the Softswitch Architecture195
Customer Premises Equipment for IP Centrex196
IP Centrex Benefits198
Does IP Telephony Include the Internet?201
Privacy: Fact or Fiction?201
Voice Over DSL/Frame/ATM--Variations on a Theme Voice over DSL (VoDSL)203
Services Perspective206
Chapter 10The Future of IP Telephony207
Beefing Up IP Telephony210
Industry Changes Affecting IP Telephony212
Disruptive Technology Takes Center Stage213
Internet Call Centers216
Fax Over IP220
Voice Mail over IP222
IP Telephony and Denial of Service (DoS) Attacks224
The Future for Equipment Vendors225
The Future for Telecommunications Service Providers227
The Future for Business Users229
The Evolution Continues230
Appendix AGlossary233
Appendix BResource List239
Solution Vendors239
Standards Organizations241
Newsletters and Information Sites241
General Interest URLs242

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IP Telephony Demystified 4.6 out of 5 based on 0 ratings. 5 reviews.
Guest More than 1 year ago
Camp undertakes the challenge of blending technologically difficult concepts with the business drivers and impacts that organizations face VoIP/IPT. The book is a good resource for those who don't have the desire, need or time to read the voluminous amount of information published in various standards & RFCs. It simplifies the concepts, describes the "whats" and the "whys", and it gives the reader a solid foundation on which to communicate within the arena of VoIP and IPT.
Guest More than 1 year ago
Are you a professional (engineer, manager, director, account executive) who needs to understand the salient issues surrounding IP Telephony quickly? If so, Ken Camp's new book is for you. I've been studying this topic for several years and never before have I come across a volume that is so succinct and approachable, and yet complete in its coverage of this much discussed technology arena. Are you a scientist or software developer who needs a book that covers every last bit of technical minutae, right down to the definition of every bit's function according to every published standard? If so, go get a copy of the standards. This book is for people who need to quickly understand the relevant aspects of IP Telephony and make sound business and technical decisions; if that includes you then you can't do better than Camp's latest work.
Guest More than 1 year ago
This technology is complex and difficult to understand. The advantages of IP Telephony can be hard to grasp. Ken Camp¿s book truly demystifies IP Telephony. Ken explains the technology in ways that keep technical people interested, yet simplifies it for decision makers to implement IP Telephony solutions successfully. I will continue to take advantage of this book as an Internet consultant. More importantly, so will my clients.
Guest More than 1 year ago
Mr. Camp's IP Telephony Demystified does an excellent job of providing the reader with a managerial and ¿why it matters¿ look at the issues and reasons surrounding the application of IP Telephony. What I appreciated most was the grace and style of dealing with a myriad of complex interrelated aspects of this complicated subject matter area. I especially found Chapter 7, Gateways between Networks, relevant to sorting out the various ILEC, ITSP and Enterprise Models. In addition, Chapter 8, Premise-based Telephony, contains some keen insights not seen in other related books.
Guest More than 1 year ago
Ken does a great job exploring the business ramifications, as well as technology underlying, IP Telephony. He tackles both the ¿how does it work¿ together with the ¿why we should care¿ so that those making strategic and technical decisions can make informed ones. Chapter 6 especially helps direct and pose tough questions one should ask for whether this solution is right for you. Ken is honest, straight forward and direct in his discussions. His use of analogies is such that even beginners, new the concepts can understand what is going on. Ken uses simple to understand language in his writing style for as the name implies, it is IP Telephony Demystified. Here is someone who has finally gone beyond just what the technology is and how it works to investigate, explore and uncover the ways to be success implementing it, and why you should or should not do so. To overlook IP Telephony as a new tool for tomorrow, along with Ken¿s book, would be a serious mistake.