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IP Telephony Demystified

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ISBN-10: 0071406700

ISBN-13: 9780071406703

Edition: 2003

Authors: Ken Camp

List price: $58.00
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Description:

IP (Internet Protocol) telephony is simply voice sent over the internet, rather than the traditional phone system. IP telephony has the potential to lower long distance rates by a factor of ten, and can combine voice and data services IT people are being asked to implement or investigate IP telephony solutions. Small companies are looking to economize by adopting it. Everyone is wondering what IP telephony can do for them. This book will demystify IP telephony for both business people and technology generalists. These people need to understand why to either embrace or shun IP telephony for their individual needs, this book will give them the information to do just that.
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Book details

List price: $58.00
Copyright year: 2003
Publisher: McGraw-Hill Education
Publication date: 11/13/2002
Binding: Paperback
Pages: 254
Size: 7.75" wide x 9.00" long x 0.75" tall
Weight: 0.528
Language: English

Camp is the founder and president of IP Adventures, Inc., a strategic business and technology consulting firm.

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