Cisco.Press.Voice.over.IP.Fundamentals.pdf

Voice over IP Fundamentals

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Dedications

Jonathan Davidson :

Wife, Daughter, Son

To my beautiful wife Shelly for putting up with me during the nights and weekends

spent working on this book. A better wife, mother, and friend could not be asked for.

To my daughter Megan, who will probably be learning data and voice networking in

high school by the time she gets there. Also, my son Ethan, who will probably think

that video and audio conferencing is as common as videogames and VCRs were to

my generation.

James Peters :

To my son Justin, for his curiousity, friendship, and the bond that we share.

To my son Zachary, who has taught me to laugh and to not take life so seriously.

To my daughter Breanna, whose smile makes me realize how beautiful life is.

Voice over IP Fundamentals

Feedback Information

Acknowledgments

Introduction

Purpose of This Book

Audience

Chapter Organization

Features and Text Conventions

Timeliness

The Road Ahead…

I: PSTN

1. Overview of the PSTN and Comparisons to Voice over IP

The Beginning of the PSTN

Understanding PSTN Basics

PSTN Services and Applications

Drivers Behind the Convergence Between Voice and Data Networking

Packet Telephony Network Drivers

New PSTN Network Infrastructure Model

Summary

2. Enterprise Telephony Today

Similarities Between PSTN and ET

Differences Between PSTN and ET

Common ET Designs

Summary

3. Basic Telephony Signaling

Signaling Overview

E&M Signaling

CAS

ISDN

QSIG

DPNSS

Summary

4. Signaling System 7

SS7 Network Architecture

SS7 Protocol Overview

SS7 Examples

List of SS7 Specifications

Summary

5. PSTN Services

Plain Old Telephone Service

Integrated Services Digital Network

Business Services

Service Provider Services

Summary

II: Voice over IP Technology

6. Voice over IP Benefits and Applications

Key Benefits of VoIP

Packet Telephony Call Centers

Service Provider Calling-Card Case Study

Value-Added Services

Enterprise Case Study: Acme Corporation

Summary

7. IP Tutorial

OSI Reference Model

Internet Protocol

Data Link Layer Addresses

IP Addressing

Routing Protocols

EIGRP

IP Transport Mechanisms

Summary

References

8. VoIP: An In-Depth Analysis

Delay/Latency

Jitter

Pulse Code Modulation

Voice Compression

Echo

Packet Loss

Voice Activity Detection

Digital-to-Analog Conversion

Tandem Encoding

Transport Protocols

Dial-Plan Design

End Office Switch Call-Flow Versus IP Phone Call

Summary

References

9. Quality of Service

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