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It is now clear that the latest evolution of the wireless communication system, for example, the ultra mobile broadband (UMBtrade) system developed in 3GPP2, has significantly increased the packet data efficiency of the system. However, as voice is still a major part of the revenue stream for many operators, voice efficiency is still of prime concern in the industry. A detailed end-to-end scheme for supporting VoIP in the air interface, designated for the UMB system, is described. Full duplex simulations were performed to evaluate the proposed scheme. The results show that the UMB system has significantly improved upon the VoIP capacity. A 5-MHz UMB system can support 320 VoIP users while simultaneously supporting a forward link data throughput of over 2.26 Mbps. Although more of the delay budget was expanded on the reverse link, the system is still reverse link limited.