Abstract
Voice over IP (VoIP) applications such as Skype, Google Talk, and FaceTime are promising technologies
for providing cheaper voice calls to end users over extant networks. Wireless networks such as WiMAX and
Wi-Fi focus on providing perfection of service for VoIP. However, there are numerous aspects that affect
quality of voice connections over wireless networks 13. The adoption of Voice over Wireless Local Area
Network is on tremendous increase due its relief, non-invasive, economicexpansion, low maintenance cost,
universal coverage and basic roaming capabilities. However, expansion Voice over Internet Protocol
(VoIP) over Wireless Local Area Network (WLAN) is a challenging task for many network specialist and
engineers. Voice codec is one of the most critical components of a VoIP system. In this project, we evaluate
the performance analysis of various codecs such as G.711, G.723 and G.729 over Wi-Fi networks. NS2 WiFi simulation models are designed. Performance metrics such as Mean Opinion Score (MOS), average
end-to-end latency, and disconcert are evaluated and discussed 13.
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