Scalable VoIP Mobility

Chapter 3. Elements of Voice Quality

3.0. Introduction

This chapter examines the factors that go into voice quality. First, we will look at how voice quality was originally, and introduce the necessary measurement metrics (MOS and R-Value). After that, we will move on to describing the basis for repeatable, objective metrics, by a variety of models that start out taking actual voice samples into account, but then turn into guidelines and formulas about loss and delay that can be used to predict network quality. Keep in mind that the point of the chapter is not to substitute for thousand-page telephony guidelines, but to introduce the reader to the basics for what it takes, and argue that perhaps—with mobility—the exactitude typically expected in ...