短語詞組短語IP Centrex 交換機(jī);IP集中用戶交換機(jī)Centrex Exchange 中用戶交換機(jī)customer centrex 用戶合用交換機(jī)Centrex operation CENTREX 業(yè)務(wù)VCC Centrex 通信總機(jī)Centrex Compatibility 中用戶交換業(yè)務(wù)兼容性centrex service 集群業(yè)務(wù)centrex system centrex 系統(tǒng)CENTREX Centrex 虛擬用戶交換機(jī)業(yè)務(wù) 返回 centrex