Quality Aspects of Internet Telephony

Internet telephony has had a tremendous impact on how people commu-nicate. Many now maintain contact using some form of Internet telephony. Therefore the motivation for this work has been to address the quality as-pects of real-world Internet telephony for both fixed and wireless telecommu-nication. The focus has been on the quality aspects of voice communication, since poor quality leads often to user dissatisfaction. The scope of the work has been broad in order to address the main factors within IP-based voice communication. The first four chapters of this dissertation constitute the background material. The first chapter outlines where Internet telephony is deployed today. It also motivates the topics and techniques used in this research. The second chapter provides the background on Internet telephony includ-ing signalling, speech coding and voice Internetworking. The third chapter focuses solely on quality measures for packetised voice systems and finall