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Call Admission Control (CAC) functionality is a critical requirement for guarantee the desired Quality of Service (QoS) for voice calls in IP-based wireless networks. In this paper, three different CAC strategies for Voice over IP (VoIP) traffic over Wireless Access Networks with packet buffering are mathematically analyzed through a joint call and packet level discrete time tele-traffic model. The admission criterion (i.e., admission threshold) of new sessions of these strategies is based on either the total number of sessions, the number of active sessions (i.e., sessions in talk-spurt periods), or the number of packets queued in the buffer. Admission threshold and buffer size can be both controlled for QoS provisioning in terms of session blocking and packet dropping probabilities.
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