同义词
1)wireless private branch exchanger (WPBX),无线专用交换机2)private branch exchange (PBX),专用分线交换机3)pbx,专用交换机4)private branch exchange allocation (PBX allocation),专用分线交换机分配5)EPBX (electronic private branch exchange),专用支线电子交换机6)private exchange,private branch exchange,专用交换机，用户交换机
