Voice over IP First-Step By Kevin Wallace Publisher: Cisco Press Pub Date: December 07, 2005 ISBN: 1-58720-156-9 Pages: 336 Table of Contents | Index 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 Voice over IP First-Step By Kevin Wallace Publisher: Cisco Press Pub Date: December 07, 2005 ISBN: 1-58720-156-9 Pages: 336 Table of Contents | Index Copyright About the Author About the Technical Reviewers Acknowledgments Icons Used in This Book Introduction How This Book Is Organized Who Ought to Read This Book Stuff You'll Find in This Book For More Information 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 Case Study: Your Turn to Put the Pieces in Place Chapter Summary Chapter Review Questions 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 Case Study: Your Turn to Choose the Bandwidth Chapter Summary Chapter Review Questions 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 Chapter Summary Chapter Review Questions 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 Setting Guidelines for Who Can Make Calls Replacing Old Phones with IP Phones Selecting Features for IP Phones 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 Chapter Summary Chapter Review Questions Chapter 5 Speaking the Gateways' Languages Gateway Protocols: The Languages of Love The Tried and True Language: H.323 Cisco's Very Own: MGCP The New Kid on the Block: SIP Case Study: Your Turn to Be Trilingual Chapter Summary Chapter Review Questions Chapter 6 Why Quality Matters Too Many Swimmers in the Bandwidth Pool Being Politically Incorrect: Treating Special Traffic in a Special Way Giving Voice Top Priority Feeling a Little Congested? Setting Speed Limits on Traffic Doing More with Less (Bandwidth) Automatically Configuring QoS with AutoQoS Case Study: Your Turn to Use Your New "Quality of Service" Tools Chapter Summary Chapter Review Questions Chapter 7 VoIP Supporting Roles Leave a Message at the Beep: the Cisco Answer to Unified Messaging Have Your People Call My People: Creating a Conference Call Your Call Is Very Important to Us: The Cisco Answer to Call Centers Case Study: Your Turn to Pick Add-On Features Chapter Summary Review Questions Appendix A Answers to Chapter Review Questions Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Appendix B Next Steps: Where Do I Go From Here? Basic Router and Switch Configuration IP Telephony Certifications Glossary A A B C D E F G H I J K L M N O P Q R S T U V W Index Copyright Voice over IP First-Step Kevin Wallace Copyright © 2006 Cisco Systems, Inc Published by: Cisco Press 800 East 96th Street Indianapolis, IN 46240 USA All rights reserved No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without written permission from the publisher, except for the inclusion of brief quotations in a review Printed in the United States of America 1 2 3 4 5 6 7 8 9 0 First Printing December 2005 Library of Congress Cataloging-in-Publication Number: 2005926125 Warning and Disclaimer This book is designed to provide information about the basics of Voice over IP (VoIP) Every effort has been made to make this book as complete and as accurate as possible, but no warranty or fitness is implied The information is provided on an "as is" basis The authors, Cisco Press, and Cisco Systems, Inc., shall have neither liability nor responsibility to any person or entity with respect to any loss or damages arising from the information contained in this book or from the use of the disks or programs that might accompany it The opinions expressed in this book belong to the author and are not necessarily those of Cisco Systems, Inc Trademark Acknowledgments All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized Cisco Press or Cisco Systems, Inc cannot attest to the accuracy of this information Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark Publisher John Wait Editor-in-Chief John Kane Executive Editor Mary Beth Ray Cisco Representative Anthony Wolfenden Cisco Press Program Manager Nannette M Noble Production Manager Patrick Kanouse Senior Development Editor Christopher 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purchases or special sales For more information please contact: U.S Corporate and Government Sales 1-800-382-3419 corpsales@pearsontechgroup.com For sales outside the U.S please contact: International Sales international@pearsoned.com Index [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] Q.931 signaling protocol QoS (quality of service) AutoQoS bandwidth case study configuring congestion management traffic compressing bandwidth setting speed limits on voice quality of service [See QoS] quantization queuing Catalyst-based CB-WFQ FIFO strategies 2nd FQ LLQ PQ WFQ Index [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] random early detection (RED) RAS (Registration, Admission, and Status) Real-Time Transport Protocol (RTP) 2nd 3rd records bandwidth CDRs RED (random early detection) redundancy CCMs devices VRRP Registered Jack (RJ) Registration, Admission, and Status (RAS) registration, gateways reliability, optimizing remarking, CoS remote site (SRST), maintenance replacing IP Phones switches with CCM trunks replication requirements for telephony systems residential gateways resolution, gateways resources, transcoding ring backs 2nd ring cadence ring frequency ring patterns Ring wires rings, number of RJ (Registered Jack) RJ-45 connectors root bridges round trip delays routers CME digital circuits phone lines RTP (Real-Time Transport Protocol) 2nd 3rd run-time data Index [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] sampling SAP (Session Announcement Protocol) SCCP (Skinny Client Control Protocol) 2nd 3rd scheduling, byte-by-byte scrambling SCCP screens (LCD) Secure Real-Time Transport Protocol (SRTP) security, CCM selection IP Phone features of bandwidth sequence numbers serialization, delay servers CCM case study CME routers CoS configuration deploying grouping IP Phone features IP Phone replacement security video voice calls Cisco Unity gateways case study H.323 MGCP protocols SIP MCS subscriber UASs services, voice mail Session Announcement Protocol (SAP) session initiation protocol 2nd SF (Super Frame) shaping 2nd 3rd signal-to-noise (S/N) ratios signaling CAS CSS protocols types of 2nd 3rd Signaling System 7 (SS7) Simplified Messaging Desk Interface (SMDI) protocol single token buckets single-site CCM design models SIP (session initiation protocol) 2nd sizing windows Skinny Client Control Protocol (SCCP) 2nd 3rd slow start (TCP) SMDI (Simplified Messaging Desk Interface) protocol SMDR (Station Message Detail Recorder) Soft QoS softkeys (IP Phones) Spanning Tree Protocol (STP) speakers, frequency response speed dial buttons 2nd speed limits, setting on traffic SRST (Survivable Remote Site Telephony) 2nd SRTP (Secure Real-Time Transport Protocol) SS7 (Signaling System 7) Station Message Detail Recorder (SMDR) stations, connecting to STP (Spanning Tree Protocol) streams, RTP subscriber servers Super Frame (SF) supervisory signaling Survivable Remote Site Telephony (SRST) 2nd sweet spots, sampling switchback (MGCP) switches 2nd CCM Ethernet hybrid phone phone ports redundancy switchover (MGCP) synchronization Index [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] T1 interfaces, configuring tail dropped packets TCP (Transmission Control Protocol) connect messages slow start synchronization TDM (time-division multiplexing) telephones, replacing old with IP Phones telephony networks key systems overview of PBX PSTN signaling voice network designs terminals, H.323 tertiary CCMs thresholds, minimum time-division multiplexing (TDM) Tip wires token buckets tones, call progress ToS (type of service) touch tone dialing tracking bandwidth calls traffic bandwidth busy hour conditioners 2nd conforming exceeding marking QoS speed limits violating traffic engineering trained ears transcoding resources Transmission Control Protocol [See TCP] Triple Data Encryption Standard (3DES) troubleshooting MTBF MTTR quantization trunks 2nd calculating interoffice replacing trust boundaries type of service (ToS) types of calls (H.323) of compression of dialing 2nd of networks of PHB of signaling 2nd 3rd Index [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] UACs (user agent clients) UAs (user agents) UASs (user agent servers) undersampling unified messaging Unity (Cisco) CCM integration PBX integration UplinkFast User agent clients (UACs) User agent servers (UASs) user agents (UAs) Index [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] VAD (voice activity detection) verification, identity video CCM MeetingPlace violating traffic Virtual Router Redundancy Protocol (VRRP) VLANs, auxiliary (IP Phones) voice network design QoS voice activity detection (VAD) Voice Bandwidth Calculator voice intelligence voice mail services voice-enabled Ethernet switches Vonage VRRP (Virtual Router Redundancy Protocol) Index [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] WAN (wide-area network) call processing model oversubscriptions waveforms, encoding web collaboration, MeetingPlace Weighted Fair Queuing (WFQ) Weighted RED (WRED) 2nd Weighted Round Robin (WRR) WFQ (Weighted Fair Queuing) wide-area network [See WAN] windows, sizing wiring, telephony networks WRED (weighted random early detection) WRED (Weighted RED) 2nd WRR (Weighted Round Robin) Index [SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] XML (Extensible Markup Language), IP Phone support ... Identify the advantages of a Voice over IP (VoIP) network Welcome to the world of Voice over IP (VoIP)! Think of it, sending your company's voice traffic (or even your home's voice traffic) over a data network... Voice over IP First- Step By Kevin Wallace Publisher: Cisco Press Pub Date: December 07, 2005 ISBN: 1-58720-156-9 Pages: 336 Table of Contents... ASIST, BPX, Catalyst, CCDA, CCDP, CCIE, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, the Cisco IOS logo, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Empowering the Internet