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Cisco Voice over IP (CVOICE) (Authorized Self-Study Guide), 3rd Edition

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  • Copyright 2009
  • Edition: 3rd
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  • ISBN-10: 1-58705-554-6
  • ISBN-13: 978-1-58705-554-6
  • eBook (Watermarked)
  • ISBN-10: 1-58705-808-1
  • ISBN-13: 978-1-58705-808-0

Authorized Self-Study Guide

Cisco Voice over IP (CVOICE)

Third Edition

Foundation learning for CVOICE exam 642-436

Kevin Wallace, CCIE No. 7945

Cisco Voice over IP (CVOICE), Third Edition, is a Cisco-authorized, self-paced learning tool for CCVP foundation learning. This book provides you with the knowledge and skills required to plan, design, and deploy a Cisco voice-over-IP (VoIP) network and to integrate gateways and gatekeepers into an enterprise VoIP network. By reading this book, you will gain a thorough understanding of converged voice and data networks and also the challenges you will face implementing various network technologies.

Cisco Voice over IP (CVOICE) presents you with information on the foundational elements of VoIP calls, the description of dial plans, and the implementation of gateways, gatekeepers, and Cisco Unified Border Elements (Cisco UBEs). The book gives you the information needed to implement and support data and voice integration solutions at the network-access level.

Whether you are preparing for CCVP certification or simply want to gain a better understanding of VoIP fundamentals, you will benefit from the foundation information presented in this book.

Cisco Voice over IP (CVOICE), Third Edition, is part of a recommended learning path from Cisco 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 by authorized Cisco Learning Partners worldwide, please visit http://www.cisco.com/go/authorizedtraining.

Kevin Wallace, CCIE No. 7945, is a certified Cisco instructor, and he teaches courses in the Cisco CCSP, CCVP, and CCNP® tracks. With 19 years of Cisco networking experience, Kevin has been a network design specialist for the Walt Disney World Resort and a network manager for Eastern Kentucky University.

  • Integrate VoIP into an existing data network
  • Design a VoIP network for optimal voice quality
  • Examine the various call types in a VoIP network
  • Configure analog voice interfaces and dial peers
  • Perform call signaling over digital voice ports
  • Implement H.323, MGCP, and SIP protocols on Cisco IOS® gateways
  • Identify dial plan characteristics
  • Configure advanced dial plans
  • Deploy H.323 gatekeepers
  • Implement a Cisco UBE router to provide protocol interworking

Companion CD-ROM

The CD-ROM contains a bonus 90 minutes of video demonstrations. Watch the author perform fundamental CVoice configuration tasks in a series of six video-on-demand labs.

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: Voice over IP

Covers: CVoice exam 642-436

Sample Pages

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Table of Contents

Chapter 1 Introducing Voice over IP Networks 3

VoIP Fundamentals 3

    Cisco Unified Communications Architecture 3

    VoIP Overview 4

    Components of a VoIP Network 6

    VoIP Functions 7

    VoIP Signaling Protocols 9

    The H.323 Umbrella 9

MGCP 11

    Session Initiation Protocol 12

    Skinny Client Control Protocol 12

    Comparing VoIP Signaling Protocols 12

    VoIP Service Considerations 15

    Media Transmission Protocols 16

    Real-Time Transport Protocol 16

    RTP Control Protocol 17

    Compressed RTP 18

    Secure RTP 20

Introducing VoIP Gateways 21

    Understanding Gateways 21

    Modern Gateway Hardware Platforms 24

    Well-Known and Widely Used Enterprise Models 27

    Standalone Voice Gateways 30

    Summary of Voice Gateways 34

    IP Telephony Deployment Models 36

Summary 50

Chapter Review Questions 51

Chapter 2 Considering VoIP Design Elements 55

VoIP Fundamentals 55

    IP Networking and Audio Clarity 55

    Audio Quality Measurement 61

    VoIP and QoS 63

    Transporting Modulated Data over IP Networks 66

    Understanding Fax/Modem Pass-Through, Relay, and Store and Forward 67

    Modem Relay 71

    Gateway Signaling Protocols and Fax Pass-Through and Relay 74

    DTMF Support 82

Processing Voice Packets with Codecs and DSPs 84

    Codecs 85

    Impact of Voice Samples and Packet Size on Bandwidth 87

    Data Link Overhead 88

    Security and Tunneling Overhead 88

    Calculating the Total Bandwidth for a VoIP Call 88

    Effects of Voice Activity Detection on Bandwidth 90

    DSP 91

    Codec Complexity 95

    DSP Requirements for Media Resources 98

    Configuring Conferencing and Transcoding on Voice Gateways 107

    Cisco IOS Configuration Commands for Enhanced Media

    Resources 114

    Verifying Media Resources 119

Summary 120

Chapter Review Questions 121

Chapter 3 Routing Calls over Analog Voice Ports 125

Introducing Analog Voice Applications on Cisco IOS Routers 125

    Local Calls 125

    On-Net Calls 126

    PLAR Calls 127

    PBX-to-PBX Calls 128

    Intercluster Trunk Calls 129

    Summarizing Examples of Voice Port Applications 131

Introducing Analog Voice Ports on Cisco IOS Routers 132

    Voice Ports 132

    Analog Voice Ports 133

    Configuring Analog Voice Ports 144

    Trunks 150

    Centralized Automated Message Accounting 154

    Direct Inward Dial 157

    Timers and Timing 159

    Verifying Voice Ports 160

Introducing Dial Peers 164

    Understanding Call Legs 164

    Understanding Dial Peers 165

    Configuring POTS Dial Peers 167

    Configuring VoIP Dial Peers 169

    Configuring Destination Pattern Options 172

    Matching Inbound Dial Peers 175

    Characteristics of the Default Dial Peer 177

    Matching Outbound Dial Peers 179

Summary 180

Chapter Review Questions 181

Chapter 4 Performing Call Signaling over Digital Voice Ports 185

Introducing Digital Voice Ports 185

    Digital Trunks 186

    T1 CAS 188

    E1 R2 CAS 189

    ISDN 191

    ISDN Signaling 195

    Configuring a T1 CAS Trunk 208

    Configuring an E1 R2 Trunk 218

    Configuring an ISDN Trunk 220

    Verifying Digital Voice Ports 225

Using QSIG for Digital Signaling 232

    QSIG Overview 232

    Configuring QSIG Support 236

    Verifying QSIG Trunks 239

Summary 242

Chapter Review Questions 243

Chapter 5 Examining VoIP Gateways and Gateway Control Protocols 247

Configuring H.323 247

    H.323 Gateway Overview 247

    Why H.323 250

    H.323 Network Components 253

    H.323 Call Establishment and Maintenance 258

    H.323 Call Flows 259

    H.323 Multipoint Conferences 261

    Configuring H.323 Gateways 263

    Verifying an H.323 Gateway 274

Implementing MGCP Gateways 275

    MGCP Overview 275

    Why MGCP 276

    MGCP Architecture 277

    Basic MGCP Concepts 280

    MGCP Call Flows 283

    Configuring MGCP Gateways 285

    Verifying MGCP 290

Implementing SIP Gateways 293

    SIP Overview 294

    Why SIP 296

    SIP Architecture 297

    SIP Call Flow 299

    SIP Addressing 302

    SIP DTMF Considerations 304

    Configuring SIP 305

    Verifying SIP Gateways 309

Summary 315

Chapter Review Questions 316

Chapter 6 Identifying Dial Plan Characteristics 321

Introducing Dial Plans 321

    Dial Plan Overview 321

    Endpoint Addressing 324

    Call Routing and Path Selection 325

    Digit Manipulation 325

    Calling Privileges 326

    Call Coverage 326

    Scalable Dial Plans 326

    PSTN Dial Plan Requirements 328

    ISDN Dial Plan Requirements 330

    Configuring PSTN Dial Plans 331

    Verifying PSTN Dial Plans 341

Numbering Plan Fundamentals 348

    Numbering Plan Overview 348

    Numbering Plan Categories 349

    Scalable Numbering Plans 351

    Overlapping Numbering Plans 352

    Private and Public Numbering Plan Integration 353

    Enhancing and Extending an Existing Plan to Accommodate VoIP 355

    911 Services 357

    Implementing a Numbering Plan Example 359

Summary 361

Chapter Review Questions 362

Chapter 7 Configuring Advanced Dial Plans 367

Configuring Digit Manipulation 367

    Digit Manipulation 367

    Digit Collection and Consumption 370

    Digit Stripping 371

    Digit Forwarding 372

    Digit Prefixing 373

    Number Expansion 374

    Caller ID Number Manipulation 377

    Voice Translation Rules and Profiles 380

    Voice Translation Profiles Versus the dialplan-pattern Command 390

    Configuring Digit Manipulation 393

Configuring Path Selection 397

    Call Routing and Path Selection 397

    Dial Peer Matching 398

    Matching Dial Peers in a Hunt Group 404

    H.323 Dial-Peer Configuration Best Practices 405

    Path Selection Strategies 406

    Site-Code Dialing and Toll-Bypass 407

    Tail-End Hop—Off (TEHO) 409

    Configuring Site-Code Dialing and Toll-Bypass 410

    Outbound Site-Code Dialing Example 415

    Inbound Site-Code Dialing Example 416

    Configuring TEHO 417

Implementing Calling Privileges on Cisco IOS Gateways 420

    Calling Privileges 420

    Understanding COR on Cisco IOS Gateways 421

    Understanding COR for SRST and CME 426

    Configuring COR for Cisco Unified Communications Manager

    Express 427

    Configuring COR for SRST 433

    Verifying COR 434

Summary 434

Chapter Review Questions 436

Chapter 8 Configuring H.323 Gatekeepers 441

H.323 Gatekeeper Fundamentals 441

    Gatekeeper Overview 441

    Gatekeeper Hardware and Software Requirements 445

    Gatekeeper Signaling 445

    Call Flows with a Gatekeeper 464

    Zone Prefixes 468

    Technology Prefixes 469

    Gatekeeper Call Routing 471

    Directory Gatekeepers 479

    Gatekeeper Transaction Message Protocol 486

    Verifying Gatekeepers 487

Configuring H.323 Gatekeepers 489

    Gatekeeper Configuration Steps 489

    Configuring Gatekeeper Zones 493

    Configuring Zone Prefixes 494

    Configuring Technology Prefixes 495

    Configuring Gateways to Use H.323 Gatekeepers 497

    Dial-Peer Configuration 500

    Verifying Gatekeeper Functionality 502

Providing Call Admission Control with H.323 504

    Gatekeeper Zone Bandwidth Operation 504

    RAI in Gatekeeper Networks 510

Summary 515

Chapter Review Questions 516

Chapter 9 Establishing a Connection with an Internet Telephony Service

Provider 521

Introducing the Cisco Unified Border Element Gateway 521

    Cisco Unified Border Element Overview 521

    Cisco IOS Image Support for Cisco UBE Gateways 523

    Cisco UBE Gateways in Enterprise Environments 523

    Protocol Interworking on Cisco UBE Gateways 526

    Media Flows on Cisco UBE Gateways 528

    Codec Filtering on Cisco UBEs 530

RSVP-Based CAC on Cisco UBEs 530

    Cisco UBE Gateways and Gatekeeper Interworking 532

    Cisco UBE Gateway Call Flows 533

Configuring Cisco Unified Border Elements 538

    Protocol Interworking Command 538

    Configuring H.323-to-H.323 Interworking 539

    Configuring H.323-to-SIP Interworking 541

    Media Flow and Transparent Codec Commands 542

    Configuring Transparent Codec Pass-Through and Media Flow-Around 543

    Configuring Cisco UBEs and Via-Zone Gatekeepers 544

    Verifying Cisco UBEs and Via-Zone Gatekeepers 546

Summary 549

Chapter Review Questions 550

Appendix A Answers to Chapter Review Questions 553

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