IP Telephony Demystified / Edition 1
  • Alternative view 1 of IP Telephony Demystified / Edition 1
  • Alternative view 2 of IP Telephony Demystified / Edition 1

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

IS INTERNET TELEPHONY FOR YOU? IF SO, HOW? ANSWERS HERE

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

…  See more details below

Overview

“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

IS INTERNET TELEPHONY FOR YOU? IF SO, HOW? ANSWERS HERE

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.

Read More

Product Details

ISBN-13:
9780071406703
Publisher:
McGraw-Hill Professional Publishing
Publication date:
10/25/2002
Series:
Demystified Series
Pages:
254
Product dimensions:
7.30(w) x 9.20(h) x 0.57(d)

Table of Contents

Prefacexi
Acknowledgmentsxv
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
Switching17
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
Gigabandwidth143
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
WiFi174
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
Index243

Read More

Customer Reviews

Average Review:

Write a Review

and post it to your social network

     

Most Helpful Customer Reviews

See all customer reviews >