Virtual-centrex meaning

A Centrex technique that networks multiple geographically distributed CO Centrex systems, thereby creating the effect that all users are collocated and served by a single CO switch. See also Centrex.
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IP Centrex, which is Centrex service based on a softswitch platform and delivered over the Internet, rather than based on a central office (CO) circuit switch and delivered over the public switched telephone network (PSTN). See also Centrex, CO, Internet, PSTN, and softswitch.
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