Evaluation of Voice over Internet Protocol Quality of Service

Abstract

The fact that Visual and vocal communication can be transferred through various channels such as Public Switched Telephone Network (PSTN) and packet switched network is undisputable. Voice over Internet protocol (VoIP) is a thriving technology that has been increasingly popular in recent times due to its affordability and reduced cost in making calls over an existing network infrastructure. However, the quality of VoIP is mainly impaired by jitter, delay, packet loss and some other parameters. This research was carried out to evaluate voice quality in VoIP experimentally and to select an appropriate voice compression and decompression scheme depending on the Quality of Service of VoIP under different scenarios using simulation method. A VoIP network was simulated and deployed using Riverbed modeler academic edition 17.5 and the behavior and quality of VoIP was studied and analyzed under different scenarios. The results of the analysis and the performance evaluation presented in this work will help organizations understand how well VoIP will perform on a local network prior to its adoption, it can also guide researchers and designers to design a network for VoIP deployment and it will give network operators an opportunity to select the codec for better services of VoIP for customer satisfaction.