The study on quality requirements of interactive voice in IP network

In this paper we discuss the properties of advanced applications in terms of their end-to-end requirements for operation with high (or acceptable) quality. We also provide a review of research on the effects of network performance parameters, such as delay, loss, and jitter of Internet applications. Because advanced applications are structured as ensembles of high quality data and media flows, their quality and usability can be assessed by (I) the quality of their individual flows and (II) the degree to which requirements posed by interactions among the individual flows are satisfied. We follow this approach of studying the QoS requirements of advanced applications, that is, we examine the QoS properties of the individual, elementary flows and the requirements that arise from their relationships within the application scenario.