Voice over IP First-Step


Your first step into the world of IP telephony

  • No IP telephony experience required
  • Includes clear and easily understood explanations
  • Makes learning easy

Your first step to the world of IP telephony ...

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Your first step into the world of IP telephony

  • No IP telephony experience required
  • Includes clear and easily understood explanations
  • Makes learning easy

Your first step to the world of IP telephony begins here!

  • Learn how voice and data communications merge in voice-over-IP technology
  • Use this reader-friendly guide to understand the benefits of this technology
  • Explore real-life applications and theories through case studies in every chapter

Welcome to the world of voice over IP

We use either a telephone or e-mail for much of our day-to-day communication. Today, these two worlds are merging, and companies can place phone calls over their existing data network infrastructures using a technology called voice over IP (VoIP).

No prior experience with VoIP technology is required

Voice over IP First-Step is anyone’s introduction to the world of VoIP networks. The concepts in this book are presented in plain language, so you don’t need in-depth background knowledge to comprehend the technologies covered. If you work with data networks, if you work with telephony networks, if you’re a home user interested in how VoIP can reduce your monthly phone bill, or if the concept of VoIP simply intrigues you, this book is for you.

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Editorial Reviews

From the Publisher

"This book is easily read and provides a wealth of knowledge...this reference is an invaluable resource, and is written for all levels. This book has a tremendous wealth of knowledge. "

- Carlyle J. Melancon, Jr., Senior Technical Instructor

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Product Details

  • ISBN-13: 9781587201561
  • Publisher: Cisco Press
  • Publication date: 12/14/2005
  • Series: First-Step Series
  • Pages: 336
  • Sales rank: 724,012
  • Product dimensions: 7.31 (w) x 9.06 (h) x 0.71 (d)

Meet the Author

Kevin Wallace, CCIE® No. 7945, is a certified Cisco Systems® instructor and a full-time instructor for Thomson/NETg. With15 years of Cisco networking experience, Kevin holds a bachelor of science in electrical engineering from the University of Kentucky. Kevin is also a CCVP™, CCNP®, and CCDP® with three Cisco IP Telephony specializations.

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Table of Contents


Chapter 1 Touring the History Museum of Telephony

Dissecting a Telephony Network

The Public Switched Telephone Network: The Phone System That You Grew Up With

Private Branch Exchanges: How Big Businesses Talk

Key Systems: How Small Businesses Talk

Ringing, Dial Tone, and Other Bells and Whistles

Supervisory Signaling

Address Signaling

Information Signaling

Case Study: Your Turn to Put the Pieces in Place

Design Diagram for XYZ Company:

Design Description for XYZ Company:

Rationale for a VoIP Solution:

Suggested Solution

Chapter Summary

Chapter Review Questions

What You Will Learn

Chapter 2 Making Waves: Turning Your Voice into 1s and 0s

Chopping Your Voice into “Byte”-Size Pieces

Squeezing Your Voice into a Smaller Package

Deciding How Much Bandwidth Is Enough

Step 1: Calculating Erlangs

Step 2: Determining the Grade of Service

Step 3: Calculating the Number of Required Trunks

Step 4: Calculating the Amount of Required Bandwidth

Case Study: Your Turn to Choose the Bandwidth

Case Study Suggested Solution

Chapter Summary

Chapter Review Questions

What You Will Learn

Chapter 3 Paving the Pathway to a Voice over IP Network

Competing with the Reliability of Existing Phone Systems

Replacing PBX Trunks: Out with the Old, In with the New

Connecting a Router to a Phone Line

Connecting a Router to a Digital Circuit

Voice over IP in the Home

Case Study: Your Turn to Put the Pieces of the Puzzle Together

Design for XYZ Company:

Suggested Solution

Chapter Summary

Chapter Review Questions

What You Will Learn

Chapter 4 Meet the “Brain” of the Voice over IP Network

Replacing Your Old Phone Switch with Cisco CallManager

There Is Power in Numbers: Grouping Cisco CallManagers Together

Designers’ Challenge: Placing Cisco CallManagers in the Network

Single-Site Model

Centralized Call Processing Model

Distributed Call Processing Model

Clustering over the WAN Call Processing Model

Setting Guidelines for Who Can Make Calls

Replacing Old Phones with IP Phones

Inline Power


Additional Switch Port

XML Support

Auxiliary VLAN


Line/Speed Dial Buttons

Cisco 7902G

Cisco 7905G and 7912G

Cisco 7910G+SW

Cisco 7940G and 7960G

Cisco 7970G and 7971G-GE

Cisco IP SoftPhone

Cisco IP Communicator

Cisco 7920

Cisco 7936

Selecting Features for IP Phones




Music on Hold

Speed Dial and Abbreviated Dial

Auto Answer

Call Forward

Direct Transfer

Call Join

Immediate Divert to Voice Mail

Multilevel Precedence and Preemption

Malicious Call Identification

Call Park

Call Pickup/Group Call Pickup

Call Back

Barge and Privacy

The Cone of Silence: Securing Voice




A Picture Is Worth a Thousand Words: Adding Video to Voice Calls

Cisco CallManager in the “Express” Lane

Case Study: Your Turn to Do an Extreme Phone System Makeover

Suggested Solution

Chapter Summary

Chapter Review Questions

What You Will Learn

Chapter 5 Speaking the Gateways’ Languages

Gateway Protocols: The Languages of Love

The Tried and True Language: H.323

H.323 Pieces and Parts

H.323 Call Types

Cisco’s Very Own: MGCP

MGCP Components

MGCP Concepts

Making the MGCP Network More Fault Tolerant

The New Kid on the Block: SIP

Case Study: Your Turn to Be Trilingual

Suggested Solution

Chapter Summary

Chapter Review Questions

What You Will Learn

Chapter 6 Why Quality Matters

Too Many Swimmers in the Bandwidth Pool

Being Politically Incorrect: Treating Special Traffic in a Special Way



Congestion Management

Congestion Avoidance

Policing and Shaping

Link Efficiency

Giving Voice Top Priority


Expedited Forwarding

Assured Forwarding

Class Selector

Feeling a Little Congested?

First-In, First-Out (FIFO) Queuing

Weighted Fair Queuing (WFQ)

Priority Queuing (PQ)

Class-Based Weighted Fair Queuing (CB-WFQ)

Low Latency Queuing (LLQ)

Catalyst-Based Queuing

Throwing Packets out the Window

Random Early Detection (RED)

Weighted RED (WRED)

Explicit Congestion Notification (ECN)

Setting Speed Limits on Traffic

Shaping Frame Relay Networks

Doing More with Less (Bandwidth)

Automatically Configuring QoS with AutoQoS

Case Study: Your Turn to Use Your New “Quality of Service” Tools

Suggested Solution

Chapter Summary

Chapter Review Questions

What You Will Learn

Chapter 7 VoIP Supporting Roles

Leave a Message at the Beep: the Cisco Answer to Unified


Which Came First, the Voice Mail System or the CCM?

One-Stop Messaging

Advanced Messaging with a PBX

Have Your People Call My People: Creating a Conference Call

Your Call Is Very Important to Us: The Cisco Answer to Call Centers

Cisco IPCC Express Edition

Cisco IPCC Enterprise Edition

Case Study: Your Turn to Pick Add-On Features

Suggested Solution

Chapter Summary

Review Questions

Appendix A Answers to Chapter Review Questions

Appendix B Next Steps: Where Do I Go From Here?



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