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根据Ｃｅｎｔｒｅｘ（集中小交换机）业务用户的更易于接入和更多控制的要求，电话公司在年度会议上告诉国家Ｃｅｎｔｒｅｘ用户集团的成员，公司将怎样适应他们。美国西部处于重建其Ｃｅｎｔｒｅｘ的中期。直到２００５年现有业务将是可用的，但１９９６年９月推出一新业务。
According to the easier access and more control of Centrex subscribers, telephone companies tell members of the country’s Centrex user group at the annual meeting how companies will adapt to them. The western United States is in the middle of rebuilding its Centrex. Existing businesses will be available until 2005, but a new business was launched in September 1996.