Performance Analysis Of Voip Network Using Qos Parameters

Abstract

This report “Performance Analysis of VoIP Network Using QoS Parameters” presents the results of experiments and the analysis by which we found the characteristics in different sets of VoIP QoS, with software. There are about 1 billion fixed telephone lines and 2.5 billion cell phones in the world that use the traditional public switched telephone network (PSTN) systems. Soon, they will move to networks based on open protocols- known as Voice over Internet Protocols (VoIP). This migration is fueled by many factors, like the tremendous growth of the Internet and the World Wide Web, the rapid and low cost coverage capability through wired and wireless networks, the availability of a variety of fixed and mobile Internet accessing tools (e.g., desktop, laptop, pocket pc, dual-band cellular, etc), and the feasibility of integrating voice and data into a single infrastructure. There are three major areas of our VoIP study. First, VoIP protocols; second, VoIP Basic Network Architecture; and the third is, Performance measurement of VoIP Quality of service. from which more useful predictive models can be generated. This study falls into the combination of these three areas. Since more and more VoIP systems are appearing, characterizing the traffic of a VoIP system and studying the protocols to increase the quality of service can help to better understand and improve these systems. We have estimated the QoS obtained by the end user and analyzed performance metrics, i.e. average packet loss rate and average jitter, maintained stable values and acceptable QoS levels. In VoIP there are also unique sources of degradation including codec compression, packet loss, discarded packets, bit errors, frame erasures and various compression schemes. Voice quality measurement considers the extent of all of these factors, whether they occur in the network or outside it, and determines the overall impact of quality in the opinion of the customer, a measurement known as a Mean Opinion Score (MOS). As a result, the paper presents VoIP software and VoIP hardware phones only for the G.711 codec.