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文章简单介绍了虚拟用户小交换机（ＣＥＮＴＲＥＸ）在现网中的运用、业务性能、呼叫处理及计费，最后对ＣＥＮＴＲＥＸ在上海复旦大学运用情况作了简单介绍
This article briefly introduces the use of Centrex in the live network, service performance, call processing and billing. Finally, it gives a brief introduction on the use of CENTREX in Shanghai Fudan University