In this paper we address the issue of providing multimedia traffic support in asynchronous Ad hoc wireless networks. Since multimedia traffic has stringent bounds on end-to-end delay we do resource reservation for transmitting such traffic. The existing asynchronous MAC protocols such as RTMAC [Real-Time Traffic Support for Ad Hoc Wireless Networks] and MACA/PR [Real-Time Support in Multi-Hop Wireless Networks] when used for multimedia traffic provide inefficient utilization of network resources and affect call acceptance ratio and call drop ratio of multimedia traffic severely. Hence in this work we modify the RTMAC protocol for supporting multimedia traffic, so that it overcomes these limitations and improves packet delivery ratio and end-to-end delay of such traffic. The core concept of this protocol is a novel slot allocation strategy for efficient utilization of the available bandwidth for carrying multimedia traffic and best-effort traffic. Extensive simulations were performed to assess the performance of the protocol under varying network conditions. The simulations clearly indicate the gains in using such a slot allocation strategy for carrying multimedia traffic.