Cisco Voice over IP (Cvoice) (Authorized Self-Study Guide) / Edition 2
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Cisco Voice over IP (Cvoice) (Authorized Self-Study Guide) / Edition 2

by Kevin Wallace

ISBN-10: 1587052628

ISBN-13: 9781587052620

Pub. Date: 09/15/2006

Publisher: Pearson

Foundation learning for CCVP voice over IP

Kevin Wallace, CCIE® No. 7945

Cisco Voice over IP, Second Edition, is a Cisco®-authorized, self-paced learning tool for Cisco Certified Voice Professional (CCVP) voice over IP (VoIP) foundation learning. This book provides you with the


Foundation learning for CCVP voice over IP

Kevin Wallace, CCIE® No. 7945

Cisco Voice over IP, Second Edition, is a Cisco®-authorized, self-paced learning tool for Cisco Certified Voice Professional (CCVP) voice over IP (VoIP) foundation learning. This book provides you with the knowledge you need to implement and support data and voice integration solutions at the network-access level. By reading this book, you will gain a thorough understanding of basic IP telephony operation and router configuration, support, troubleshooting, and integration with an existing public switched telephone network (PSTN).

Cisco Voice over IP lays the foundation for gaining hands-on skills and a significant understanding of packet telephony. Coverage includes analog and digital voice connections, voice interface configuration, voice dial peer configuration, VoIP fundamentals, VoIP signaling and call control protocols, and voice quality improvement and maintenance. Chapter review questions, practice items, real-world examples, and hands-on lab exercises all help reinforce learning. Whether you are preparing for CCVP certification or simply want to gain a better understanding of VoIP, you will benefit from the foundation information presented in this book.

Cisco Voice over IP is part of a recommended learning path from Cisco Systems® that includes simulation and hands-on training from authorized Cisco Learning Partners and self-study products from Cisco Press®. To find out more about instructor-led training, e-learning, and hands-on instruction offered byauthorized Cisco Learning Partners worldwide, please visit:

Kevin Wallace, CCIE® No. 7945, CCVP, CCNP®, CCDP®, is a full-time instructor for Thomson NETg. With 17 years of Cisco internetworking experience, Kevin has been a network design specialist for The Walt Disney World Resort and a network manager for Eastern Kentucky University.

  • Understand traditional telephony network concepts and operation as well as the building blocks of packet telephony networks
  • Examine the interactions of telephony operations at an electrical level
  • Evaluate strategies for overcoming specific challenges in a VoIP network, such as the transmission of fax and modem tones
  • Attach a Cisco voice-enabled router to existing telephony devices, such as a PBX or an analog phone
  • Add call-routing intelligence to a Cisco voice-enabled router through the use of dial peers
  • Address potential challenges and design considerations associated with sending voice across an IP-based network
  • Understand the theory and configuration of the call control protocols including H.323, SIP, and MGCP
  • Mitigate voice quality issues with various Cisco quality of service (QoS) mechanisms

This volume is in the Certification Self-Study Series offered by Cisco Press®. Books in this series provide officially developed self-study solutions to help networking professionals understand technology implementations and prepare for the Cisco Career Certifications examinations.

Category: IP Communications

Covers: VoIP

Product Details

Publication date:
Self-Study Guide Series
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Product dimensions:
7.50(w) x 9.10(h) x 1.30(d)

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Table of Contents


Chapter 1
Fundamentals of Telephony Networks

Basic Components of Telephony Networks

CO Switches and Switching Systems

Privately Owned Switches

Call Signaling


Fundamentals of Packet Telephony Networks

Benefits of Packet Telephony Networks

Packet Telephony Components

Call Control

Real-Time versus Best-Effort Traffic

IP Telephony Applications

Analog Interfaces

Digital Interfaces

IP Phones

Types of Deployment


Chapter Review Questions

Chapter 2
Analog and Digital Voice Connections

Analog Voice Fundamentals

Local-Loop Connections

Local-Loop Signaling

Trunk Connections

Trunk Signaling


Analog-to-Digital and Digital-to-Analog Voice Encoding

Sampling and the Nyquist Theorem


Voice Compression Standards

Signaling Systems

Channel Associated Signaling

Common Channel Signaling Systems

Signaling System Interoperability

Enabling VoIP Fax and Modem Transmission

Cisco Fax Relay

T.38 Fax Relay

T.37 Fax Store and Forward

Fax Pass-Through

Modem Pass-Through

Modem Relay


Chapter Review Questions

Lab Exercise: Navigating Your Hands-On Lab

Task 1: Physical Connectivity

Task 2: Initial Configuration

Task 3: Exercise Verification

Suggested Solution

Chapter 3
Voice Interface Configuration

Configuring Voice Ports

Voice Applications

FXS Ports

FXO Ports

E&M Ports

Timers and Timing

Digital Voice Ports


Common Channel Signaling Options

Monitoring and Troubleshooting

Tuning Voice Quality

Electrical Characteristics

Voice Port Tuning

Configuring Echo Cancellation


Chapter Review Questions

Lab Exercise: Voice Port Configuration

Task 1: Configure FXS Port Parameters

Task 2: Exercise Verification

Suggested Solution

Chapter 4
Voice Dial Peer Configuration

Configuring Dial Peers

Understanding Call Legs

Understanding Dial Peers

Configuring POTS Dial Peers

Configuring VoIP Dial Peers

Configuring Destination-Pattern Options

Characteristics of the Default Dial Peer

Matching Inbound Dial Peers

Matching Outbound Dial Peers

Configuring Hunt Groups

Collecting and Analyzing Digits

Manipulating Digits

Special-Purpose Connections



Trunk Connection

Tie-Line Connection


Chapter Review Questions

Lab Exercise: POTS and VoIP Dial Peers

Task 1: Configure POTS Dial Peers

Task 2: Exercise Verification

Suggested Solution

Lab Exercise: PLAR Connection

Task 1: Configure PLAR

Task 2: Exercise Verification

Suggested Solution

Chapter 5
VoIP Fundamentals

Understanding VoIP Requirements

Business Case for VoIP

VoIP Functional Components

VoIP Protocols

VoIP Service Considerations


VoIP Network Architectures

Centralized Network Architectures

H.323 Distributed Network Architectures

SIP Distributed Network Architectures

Comparing Network Architectures

Simple Multisite IP Telephony Network

Interconnecting VoIP Protocols

Understanding Gateways

Practice Scenarios: Network Architecture

Building Scalable Dial Plans

Numbering Plans and Dial Plans

Scalable Dial Plans

Enhancing and Extending an Existing Plan to Accommodate VoIP

Accounting for Caller Mobility for 911 Services

Calculating Bandwidth Requirements

CODEC Payload Bandwidth Requirements

Impact of Voice Samples and Packet Size on Bandwidth

Data Link Overhead

Security and Tunneling Overhead

Calculating the Total Bandwidth for a VoIP Call

Effects of Voice Activity Detection on Bandwidth

Cisco Voice CODEC Bandwidth Calculator

Allocating Bandwidth for Voice and Data Traffic

Traffic Statistics

Establishing Network Objectives for Voice and Data

Meeting the Current Network Objective

Traffic Theory

Busy Hour


Traffic Probability Assumptions

Traffic Calculations

Call Density Matrix

Bandwidth Calculations

Security Implications of VoIP Networks

Security Policies for VoIP Networks

Threats to VoIP

Secure LAN Design

Communicating Through a Firewall

Delivering VoIP over a VPN


Chapter Review Questions

Lab Exercise: RTP Header Compression

Task 1: Change the Load Interval on Router R2’s Serial Interface

Task 2: Take a Baseline Measurement

Task 3: Enable cRTP

Task 4: Verify cRTP

Suggested Solution

Chapter 6
VoIP Signaling and Call Control Protocols

The Need for Signaling and Call Control

VoIP Signaling

Call Control Models

Call Control Translation

Call Setup

Call Administration and Accounting

H.323 Concepts and Configuration

H.323 and IP

Functional Components of H.323

H.323 Gateways

IP-to-IP Gateways

H.323 Gatekeepers

Multipoint Conferences

H.323 Call Establishment and Maintenance

RAS Messages

Call Flows

Types of Multipoint Conferences

Deploying and Configuring H.323

SIP Concepts and Configuration

SIP and Associated Standards

Cisco SIP Support

SIP Components

SIP Applications

SIP Messages

Status Codes

SIP Addressing

SIP Call Setup Models

Robust SIP Design

Cisco’s Implementation of SIP

Configuring SIP on a Cisco Router

Monitoring and Troubleshooting SIP

MGCP Concepts and Configuration

MGCP and Its Associated Standards

Basic MGCP Components

Basic MGCP Concepts

MGCP Sessions

MGCP Control Commands

MGCP Call Flows

Robust MGCP Design

Cisco's Implementation of MGCP

Configuring MGCP

Cisco Unified CallManager MGCP Configuration

Monitoring and Troubleshooting MGCP

Comparing Call Control Models

Call Control Model Feature Comparison

Strengths of H.323, SIP, and MGCP

Selecting Appropriate Call Control


Chapter Review Questions

Lab Exercise: H.323 Gatekeeper

Task 1: Configure the H.323 Gatekeeper

Task 2: Configure H.323 Gateways

Task 3: Verify the Configuration

Suggested Solution

Chapter 7
Improving and Maintaining Voice Quality

Optimizing Voice Quality

Factors that Affect Voice Quality

Quality Metrics

Objectives of QoS


AutoQoS Features

Configuring AutoQoS on a Router

AutoQoS for Enterprise

Configuring AutoQoS on a Catalyst Switch

Implementing Call Admission Control

Effects of Bandwidth Oversubscription

CAC Operation


CAC Tools


Chapter Review Questions

Lab Exercise: Router AutoQoS

Task 1: Configure AutoQoS on the Slower Interface

Task 2: Configure AutoQoS on the Faster Interface

Task 3: Exercise Verification

Suggested Solution

Appendix A
Answers to Chapter Review Questions

Appendix B
Cisco VoIP Applications



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