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This paper provides an analytical model to evaluate the paging capacity of the EVDO Rev. A air-interface. In EVDO Rev. A, many enhancements were introduced to support real-time services such as VoIP. With VoIP services, paging functionality is important to page the mobile/access terminals and correspondingly this functionality leads to increased load on the control channel. The main factors, parameters and constraints that impact paging capacity in EVDO Rev. A were shown and determine the sensitivity of paging capacity to these factors.