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VoIP implementations are nowadays the preferred information technology alternative to public switched telephone networks. With dependence on this technology, VoIP quality and performance are critical. In this paper, we implement some commonly used VoIP CODECs on Windows desktop operating systems to evaluate their performance on two versions on IP, namely IPv4 and IPv6. Performance related metrics like throughput, jitter and latency are empirically measured in all combinations of operating systems with various CODECs and IP versions. A test-bed setup is employed to measure performance related metrics. Results obtained show that there is only a slight difference in performance between TCP IPv4 and IPv6 networks, however VoIP throughput, jitter and latency values are significantly different depending on the choice of CODEC, operating system and the IP version.