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These days there is an increasing interest for VoIP over wireless LANs. QoS support for real-time services like voice in the IEEE 802.11 WLAN is an important issue. Since, IEEE 802.11 uses contention based MAC protocol - the distributed coordination function DCF, it is difficult to support the strict QoS requirements for voice in these networks. In this paper, a call admission scheme called "CAC" is proposed to achieve this goal, without changing the basic channel access mechanism of IEEE 802.11. CAC scheme regulates the arriving traffic in the wireless network to efficiently coordinate the medium among the contending traffic sources so that the network operates at optimal point, supporting the QoS requirements as well as providing better channel utilization.
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