In this paper we propose two different procedures of multichannel multiple access schemes with the slotted ALOHA protocol for both data and voice traffic and present an exact analysis to numerically evaluate the performance of the systems. In scheme I, there is no limitation on access between data transmissions and voice transmissions, i.e., all channels can be accessed by all transmissions. In scheme II, a channel reservation policy is applied, where a number of channels are used exclusively for voice packets while the remainingc hannels are used for both data and voice packets. We call the system usingsc heme I “Non-reservation system” and call the system usingsc heme II “Reservation system”. Performance characteristics include the loss probability for voice trafic, average packet delay for data traffic and channel utilization for both trafic. The performance of the scheme I and II, and the effects of the design parameters are numerically evaluated and compared to a wide-bandwidth conventional single-channel slotted ALOHA system.