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

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Overview






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: cisco.com/go/authorizedtraining.





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







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Product Details

  • ISBN-13: 9781587052620
  • Publisher: Pearson
  • Publication date: 9/15/2006
  • Series: Self-Study Guide Series
  • Edition description: REV
  • Edition number: 2
  • Pages: 486
  • Product dimensions: 7.50 (w) x 9.10 (h) x 1.30 (d)

Meet the Author


Kevin Wallace
, CCIE No. 7945, CCSI, CCVP, CCNP, CCDP, MCSE 4, CNE 4/5, 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. Kevin holds a bachelor of science degree in electrical engineering from the University of Kentucky. Among Kevin’s other publication credits are Voice over IP First-Step, CCDA/CCDP Flash Cards and Exam Practice Pack (coauthored with Anthony Sequeira), CCIE Routing and Switching Flash Cards and Exam Practice Pack (coauthored with Anthony Sequeira), and Cisco IP Telephony Flash Cards and Exam Practice Pack, all of which are available from Cisco Press. Additionally, Kevin authored the Cisco Enterprise Voice over Data Design (EVoDD) 3.3 course, was a contributing author for the Cisco IP Telephony Troubleshooting (IPTT) 2.0 course, and has written for Cisco's Packet magazine. Kevin also holds the IP Telephony Design Specialist, IP Telephony Operations Specialist, and IP Telephony Support Specialist CQS certifications.

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Table of Contents


Introduction



Chapter 1
Fundamentals of Telephony Networks


Basic Components of Telephony Networks


CO Switches and Switching Systems


Privately Owned Switches


Call Signaling


Multiplexing


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


Summary


Chapter Review Questions





Chapter 2
Analog and Digital Voice Connections


Analog Voice Fundamentals


Local-Loop Connections


Local-Loop Signaling


Trunk Connections


Trunk Signaling


Echo


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


Sampling and the Nyquist Theorem


Quantization


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


Summary


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


ISDN


Common Channel Signaling Options


Monitoring and Troubleshooting


Tuning Voice Quality


Electrical Characteristics


Voice Port Tuning


Configuring Echo Cancellation


Summary


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


PLAR


PLAR-OPX


Trunk Connection


Tie-Line Connection


Summary


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


RTP and RTCP


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


Erlangs


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


Summary

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


Summary


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


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


RSVP


CAC Tools

Summary


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


Glossary



Index


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Sort by: Showing all of 7 Customer Reviews
  • Anonymous

    Posted October 19, 2006

    Authorized Self Study Guide - Cvoice

    I was glad to see this book begin with some basics on America¿s existing telephone systems and how they came to be. Some folks anxious to `just pass the test¿ may want to skip past this material but they will be hurting themselves. IP voice is not a technology unto itself. It is a means of integrating with or portion-replacing the current telephone systems we use. That being said, let me state that this text is complete as a stand alone book and is not simply a boot camp prep document for the exam. It does however serve very well in that capacity. My point is that whether you are pursuing the certification or not, the book belongs on the shelves of anyone planning, perusing or working in the VOIP (voice over internet protocol) arena. By the time you finish chapter two you will have covered reasonably our current telephone systems, the legacy systems they grew from and how we are positioning ourselves for the move towards IP telephony. There is an interesting lab exercise at the end of chapter two. It builds fundamental connectivity between two devices but does not begin to touch on the VOIP required parameters. This is resolved as you move into chapter three which steps right into voice card / interface configuration. The book is targeted towards Cisco¿s deployment of VOIP of course but, I felt some more attention could have been given to SIP (session initiated protocol) as this will probably exist in almost any VOIP enabled network. Chapter five, which contains some of the SIP information covered in the text, does an excellent job of covering the various fundamentals of VOIP. If you¿re curious about VOIP in general, this chapter does a better job than many dedicated books on the subject. The discussion of QOS and Cisco¿s AutoQOS do a good job of covering the priority treatment required for a good VOIP user experience and the ways to simplify that within a Cisco architecture. QOS is one of those technologies that is fundamentally simple but can require a high level of micro-tuning depending on the existing environment you plan to integrate VOIP into. I am acquainted with more than one large institution that has chosen to keep the VOIP network non-integrated with the existing network. This removes some of the capitalization on the installed hardware/software base but pays that loss back in ease of deployment. Final thoughts on the book are to recommend it highly to those seeking certification as well as those already dealing with VIOP deployments or administration.

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  • Anonymous

    Posted October 20, 2006

    A Solid Book for VoIP Beginners

    This book is very well written and easy to read. It¿s ideal for those who want to learn the basics of telephony networks and Voice over IP. It is more than just an exam prep book as the name suggests, it actually helps you build up a solid knowledge foundation for Voice over IP. The author did a wonderful job in the first two chapters going through the fundamental concepts of traditional telephone networks including different call control architectures (distributed vs. centralized model) a variety of analog and digital signaling systems such as loop-start, ground-start, E&M, CAS and CCS T1 multiplexing and framing Digital-Analog/Analog-Digital conversion. The in-depth coverage on signaling systems helps you understand how they fit into the telephone system. Before diving straight into VoIP and QoS, the author analyzes the different VoIP architectures as well as traffic theory. One of the good things about this book is that rather than simply focus on the technical details of the three signaling protocols ¿ H.323 SIP and MGCP, it also gives you a 10000 foot view of these protocols and how they fit into the big picture. So you will understand the philosophy behind them and how to choose for your real life deployment. The author did a great job in explaining how Erlang B calculation works as well as the bandwidth and packet size calculation for different CODECs. In order to give readers a better understanding, the author also included detailed call setup flow analysis and basic sample configuration. Even thought it has basic configuration examples, this book is not about how to configure CallManagers and Cisco routers. QoS was touched briefly in the last chapter. Although the book doesn¿t have an in-depth discussion on congestion management and avoidance, it does give you an overview of how different QoS mechanisms can be used to improve voice quality on a data network. It also shows how you can use the Cisco AutoQoS feature to simplify the QoS configuration for VoIP. The last chapter also describes how call admission control (CAC) is implemented in H.323 SIP and MGCP. Security of VoIP is not a main focus for the author. Chapter 5 talks briefly about the requirements for firewall to support VoIP. The book primarily focuses on the Cisco implementation of H.323, SIP and MGCP, but the fundamental concept of is standard based. All in all, this book is not only a must have for those who are preparing the CVoice exam but also a great reference book for network professionals.

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  • Anonymous

    Posted December 4, 2006

    Well organized study guide

    I read Cisco Voice over IP, Second Edition, by Kevin Wallace (ISBN-13: 978-1-58705-262-0) because I worked with Cisco VoIP when it first came out, but have not kept current with new VoIP developments and improvements. Many of the books available today on Cisco VoIP are starting to get dated. I have found that Cisco Press is generally the best source for accurate and up-to-date information regarding Cisco tests. This book does a great job of covering both the basics and recent topics. The material is well presented in this book. Kevin starts with the fundamentals and legacy POTs. He then covers basic VoIP and dial-peers. He covers H.323, SIP and MGCP signaling protocols in depth. There is a good chapter on MGCP ¿ a protocol seldom used in enterprise networks that many of us need to learn for this test. The book wraps up with a chapter on QoS. Essentially everything you need to know to have a very strong understanding of VoIP is covered in this book. This book covers the latest ISR routers and call control methods. Cisco Voice over IP, Second Edition also contains some good mini-labs that you can do with just 3 routers. The best way to really learn and retain is by reading and then doing. This is especially useful in a study guide when you plan on taking the test afterward. This book goes into more detail than is required for the test so it is a great reference book for real life ¿ well after you have passed your test. This book does its job as a self-study guide and was very instrumental in my studying. It is one of the best, most up to date Cisco VoIP books available today. It helped me pass the Cisco CVOICE test on my first attempt. I recommend this book for anyone studying for this test or just brushing up on VoIP in general.

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  • Anonymous

    Posted November 29, 2006

    Good Self Study Guide

    I found this book to be very informative. The book is relatively short at 478 pages (which includes the appendix, glossary and index) As a project manager in the telecom industry I found this text to be concise , well thought and extremely well written. The first chapter is a basic primer on telephony and some of the history of telecommunications. People in the telecom or well versed probably could afford to glance as I found this section on the book a bit basic but having the background made it that way. It would be beneficial to those not knowing a lot in voice technologies and how it has evolved. It also delves into how technology has evolved to a packet based network and how the lines of a voice network and date networks are merging and blurring. The second chapter goes into some electrical signals,codecs and some theory that is taught in typical undergrad electrical engineering courses. The author Kevin Wallace does a great job in breaking this down into well written understandable concepts. The third chapter through the seventh and final chapter is where we get into router command and more hands on. The background is done, and were getting into the meat and potatoes of the book. The author does a good job with his examples and concepts. There are plenty of them and the figures are done as they are done in other Cisco Press books. The way symbols,bolding, router commands is done is the same as the other Cisco Press books. If you are comfortable with those, then this will be to your liking as well. I would have liked more practice questions or a practice CD like the CCNA primer books. I would like to know how to help prepare for the CVOICE exams with questions set up like the real life exam. This book does give you practice with the commands you need for the exam. One of the features that this book had was a few weblinks to various calculators that can be found at the Cisco website. For instance there is a link to the Voice Codec Bandwidth Calculator. Overall, I would definitely recommend using this book to study for the CVOICE exam. On a scale of one to five, I would definitely give it a four. Unfortunately I like to be well prepared, so I will probably cross reference to some other books just to make sure I am prepared to take the exams. More practice questions and a practice CD is the only thing I would recommend that the author add for a future edition.

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  • Anonymous

    Posted November 29, 2006

    Logical and thought out for beginners

    I have just finished reading the Voice over IP book from Cisco. The book is a step-by step process in the preparation and installation process needed to setup VoIP. It begins with an explanation of traditional telephone network and it components while someone with advanced knowledge of the basics devices that comprise a telephone network may think it is too simplified, the review is needed for those with no background knowledge of telephone networks. The book also provides a review of signaling systems, conversion between analog and digital, including the Nyquist Theorem again this is a necessary review for beginners. The layout of the chapters¿ content is good each section builds on the previous in a logical sequence for configuration. Each chapter contains a short summary of its content, followed by brief descriptions of the parameters within the chapter then examples of configuration procedures. At the end of each section in a chapter is a table of the commands used within that section is listed along with the sub-commands for each command. Labs are provided at the end of each chapter covering the information just reviewed. The labs are more real world than some of the earlier Cisco books with a suggested solution, indicating that other solution are also acceptable. In comparing the book content with the required information for the CVOICE exam the book contains all the required information but not in the same format the test information is laid out on Cisco¿s site. It would be hard to use the exam topic for their site as an outline and fill in the required information from the book. I did not think that the question at the end of each chapter were helpful either. While they did review the material covered they are not real world relevant to the type of questions you would get in the actual Cisco exam. This is the major problem I found with the book. While it lays out how to design and configure VoIP in a logical manner. It dose not prepare you for the written CVOICE test for the reason given above. If Cisco is going to publish the material needed to pass their test they should either lay out the book in the manner described in the exam description on their web site, or lay out the exam description the same way the book is organized. It would be much more helpful when studying.

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  • Anonymous

    Posted October 30, 2006

    Great for Self-Study or Reference

    Finally, a book I trust when studying for a test. While other vendors may very well contain all of the content necessary for exam preparation, Cisco Press is the only one I feel 100% sure about when taking Cisco exams. If you come from a data background like myself (not voice), the chapters on voice technologies and analog/digital voice are essential. While you may never have to work with PBX¿s or care what signaling is used in other countries, it¿s all fair game for test takers. I really never knew how deficient my knowledge of the old voice world was until reading this book. Local Loop Signaling, Trunk Signaling, the Nyquist Theorem (which seems to exist in every book I own), it¿s all in here. As dry as some of these topics are, the understanding of the brick-level voice construct helps in troubleshooting issues with your telco. If you aren¿t buying this book for test preparation, you¿ll be able to appreciate the chapters on voice interface configuration, configuring dial peers, dial plans, and troubleshooting. It gives details on setting up the above including the syntax of commands. I also own the CallManager Fundamentals book and the Gateway/Gatekeeper study guide. You¿ll find many of the same commands in this book as the other two. This book is broader in its scope than the Fundamentals or Gateway book. I always look for troubleshooting tools more than anything else books (any command I can put in my arsenal). I maintain a network as opposed to implement new networks for companies, so I¿m faced with network complications that consultants largely get to avoid. The `Comparing Call Control Models¿ was likely the most useful to me. Whether you use SIP, H.323, or MGCP (we use MGCP), there are plenty of `show¿ and `debug¿ commands at your disposal and are listed in the text. While I had these commands in other books as well, I personally can¿t get enough of troubleshooting techniques in books. Keeping the network up and supporting end users is what keeps me employed. My only `gotcha¿ with any book is end of chapter test-type questions. I never completely trust answer keys in the back of books and I thought I found errors in at least one question in this book. It was easy for me to catch because I knew the right answer but be on the lookout. In all, I¿d recommend this book for test takers and non-test takers. It covers some materials (dial peers, signaling and call control protocols, etc..) that are covered in other classes (Gateway/Gatekeeper class for one) and can be used as a quick reference.

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  • Anonymous

    Posted June 9, 2010

    No text was provided for this review.

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