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最近在美国虚拟专用线网(VPN)正特别成为通信热点。在美国交换专用网(SPRINT)1984年就开始用了,ATT、SDN、MCI采用V—NET名称提供服务。最近不仅内线网连普通电话也接上了,成为面向大企业的大宗减价业务。大体上每月1万美元以上通话业务的企业,均可接上VPN。一般没有接入VPN的中小企业也有接受该项业务的方法。由被称为集合体的营业者,把中小企业集合起来,凑在一起作为大宗用户和ATT缔结合同,并对其成员企业提供减价但要收取手续费,以商卖形式提供VPN业务。
Recently, Virtual Private Network (VPN) in the United States is becoming a hot spot for communication. In the United States exchange special network (SPRINT) 1984 began, ATT, SDN, MCI using V-NET name to provide services. Recently, not only the extension network but also ordinary phones has been connected to become a large-scale discount business for large enterprises. In general, more than 10,000 US dollars per month calling business enterprises, can connect to the VPN. SMEs that do not normally have access to the VPN also have a way of accepting the service. A group of business operators, called aggregators, bring together small and medium-sized enterprises to conclude contracts with ATT as bulk users and offer markdowns to their member companies for handling fees and provide VPN business through commercial sales.