Impact of Voice Coding in Performance of VoIP

VoIP applications are being widely used in today's networks challenging their capabilities to provide a good quality of experience level to the users. In particular, new wireless broadband technologies, such as WiMAX, deployed and their performance needs to assess in order to check the performance levels of VoIP services. The QoS is the main issue of implementation VOIP over WiMAX networks. This paper makes an effort to study the performance evaluation of VoIP for fixed users, as well as, the variation of the QoS parameters. The experimental results had showed that using sector antenna for both BS and SS and reduce the distance between them, increase the average MOS and decrease the average packet end-to-end delay.