介绍了虚拟用户交换机的产生及其应用，讨论了与传统的用户交换机在提供业务、使用维护等方面的不同之处。
This paper introduces the virtual PBX and its application, also discusses the difference between traditional PBX and virtual PBX in respect of support service and maintenance.
介绍了虚拟用户交换机的产生及其应用，讨论了与传统的用户交换机在提供业务、使用维护等方面的不同之处。
This paper introduces the virtual PBX and its application, also discusses the difference between traditional PBX and virtual PBX in respect of support service and maintenance.
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