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The wireless private branch exchange (PBX) system offers wireless telephone access in an office environment. In a WPBX, several base stations are connected to the PBX, and the PBX is connected to the public switched telephone network (PSTN). Since only a small number of telephones are expected to be busy at the same time, the capacity (number of the external lines) between the PBX and the PSTN is typically smaller than the sum of the capacities (radio channels) of the individual base stations. It is important to determine the capacity of the WPBX to optimize the performance of the system. This paper proposes an analytic model and a simulation model for WPBX resource planning. Based on the workload to the WPBX, our study provides the guidelines to determine the capacities of the PBX and the base stations. [ABSTRACT FROM AUTHOR]