VoIP service quality : measuring and evaluating packet-switched voice

VoIP (Voice over Internet Protocol), the next big advance in telecom, has proven difficult to implement. This resource gives service and enterprise telecom managers all the data they need on measurements, tools, and utilities to build a Voice over IP service that works as well as the telephone. Despite the features that make Voice over IP so attractive from the standpoint of cost and flexibility of telephone services, businesses will only adopt it once they've determined whether, and under what circumstances, the quality of VoIP will be satisfactory to users. This hands-on guide supplies you with all the tools you need for VoIP service quality analysis, including explicit directions for : designing subjective tests and interpreting results, selecting, extending, and applying speech distortion and multiple effects models, examining call set-up times for IP telephony, determining requirements for multimedia exchanges. Without jargon, or tech talk, Hardy delivers solid information on means of measuring, assessing, and improving VoIP quality.

Part 1: FOUNDATIONS Chapter 1: Basics Chapter 2: Principal System-Level Determinants of Connection Quality Chapter 3: Quality Expectations and Requirements Chapter 4: Impairments Created or Exacerbated by Packet Switching Part 2: MEASUREMENT AND EVALUATION OF VOICE QUALITY Chapter 5: Voice Quality Chapter 6: Service Attribute Tests Chapter 7: Measurement of Speech Distortion Chapter 8: Multiple-Effects Models Chapter 9: Applications Part 3: OTHER ASPECTS OF QUALITY OF SERVICE Chapter 10: Other Quality of Service Concerns Chapter 11: Quality of Voice for Interactive Multimedia Exchange Afterword Appendix A: Types of Codecs Appendix B: How a Jitter Buffer Works Appendix C: Extensions of the Loss/Noise Grade of Service Model Appendix D: U.S. Patents for Voice Quality Measurement and Analysis Technology References Index