This paper highlights the comparison between Worldwide Interoperability for Microwave Access (WiMAX) is based on IEEE 802.16 broadband Wireless metropolitan area networks (MANs) and Wireless Fidelity (Wi-Fi) is based on IEEE 802.11 Wireless LANs using the application of Voice Over Internet Protocol (VOIP),to benefit from the technical features when their integration to overcome the problems in the technical, and we measured the percentage of Packet loss, Throughput and the proportion of the delayUsing several scenarios.