Packet Guide to Voice Over IP by Hartpence, Bruce -- Read -- Imperial Library of Trantor

Index

Packet Guide to Voice over IP Preface

Audience Contents of This Book Conventions Used in This Book Using Code Examples Safari® Books Online How to Contact Us Acknowledgments Dedication

1. Introduction to Voice over the Internet Protocol

What Is VoIP? Real-time Versus Nonreal-time Data Why Change to VoIP?

The Business Case

VoIP and FCC Regulation

911 A Note on Power

General VoIP Topologies Power over Ethernet

PoE Basic Operation

VoIP Protocols

Signaling Protocols

Session Initiation Protocol H.323 Skinny Client Control Protocol

Transport Protocol

VoIP Basic Operation

Performance

Unified Communications Summary Standards and Reading Review Questions Review Question Answers Lab Activities

Activity 1—Review of the Standards Activity 2—Download Wireshark and the Capture Files for This Chapter Activity 3—Examine VoIP Offerings in Your Area Activity 4—Take a Look at the FCC Website Activity 5—Latency, Packet Loss, and Jitter

2. Traditional Telephony

Introduction Overview Organizations Connecting to the Traditional World Telecommunication Companies Telephone Wiring

Data Cabling, EIA568 A and B POTS and the Local Loop T-1

T-1 signaling T-1 physical layer and wiring

Integrated Services Digital Network Basic Telephone-Call Operation Summary Standards and Reading Review Questions Review Question Answers Lab Activities

Activity 1—Review Your Local Telephone Connections Activity 2—Experiment with the Desktop Telephone or VoIP Phone Activity 3—Wiring to the PBX or Central Office Activity 4—ITU-T Recommendations

3. Session Initiation Protocol

Introduction Protocol Description

Components Addressing

Basic Operation SIP Messages and Message Structure

Requests Responses Header Fields

Basic Operation Continued

Session Description Protocol (SDP)

Trunks Security Summary Standards and Reading Review Questions Review Question Answers Lab Activities

Activity 1—Build the Topology Shown Activity 2—Packet Capture Activity 3—Packet Capture Analysis Activity 4—Phone-Call Analysis Activity 5—SDP

4. The Real-Time Transport Protocol and the Real-Time Control Protocol

Protocol Description Profiles Basic Operation

Protocol Structure

Header first octet Header second octet Packet fields beyond the first two octets RTP extension header

RTP Control Protocol

Detailed Operation

Security

Vectors SRTP Operation

Summary Standards and Reading Review Questions Review Answers Lab Activities

Activity 1—Topology Build Activity 2—Analysis of the RTP Stream Activity 3—The Codec Activity 4—Analysis of the RTCP Stream

5. Codecs

Audio Frequencies Voice Signals Audio Coders and Decoders

Sampling Quantizing ITU-T G Series Specifications Codec Selection and Performance

So, what values can we expect?

Transcoding Packet Loss and Packet Loss Concealment (PLC) What Codec Are You Using? Video Signals

Sending a Series of Pictures Video Encoding

Standards Groups for Video

Profiles ITU-T Video Recommendations ISO/IEC Video Standards

Summary Standards and Reading Review Questions Review Question Answers Lab Activities

Activity 1—Colors Activity 2—File Sizes Activity 3—Audio Quality Activity 4—Video Quality

6. H.323 ITU-T Recommendation for Packet-Based Multimedia Communications Systems

Recommendation Description Subprotocols Basic Operation and Message Structure H.225 Messaging

Q.931 Fields H.225 Message Format H.225 RAS

H.225 RAS fields

H.225 Standard Messages H.225 Modes

FastStart

Other H.225 Messages

H.245 Voice Data Termination Summary Standards and Reading Review Questions Review Question Answers Lab Activities

Activity 1—Build the Topology Shown Activity 2—Capture Setup Activity 3—Packet Capture Analysis Activity 4—Phone-Call Analysis Activity 5—H.245

7. Skinny Client Control Protocol

Protocol Description

Structure Basic Header Format

Topology Construction Operational Stages

Startup Registration Picking up the Handset—Going Off-Hook Dialing a Number At the Receiver Back at the Source Phone Voice Data Teardown of the Call

Performance Measuring Off-Site Calling Summary Reading Review Questions Review Answers Lab Activities

Activity 1—Basic Topology Build Activity 2—Going Off-Hook Activity 3—Show and Debug Activity 4—Call-Flow Diagram Activity 5—Multiple Call Managers

About the Author Colophon Copyright

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