One of the mysteries of the English language finally explained.
A telephone service in which a group of phone lines can be joined by part of the local exchange acting as a private exchange.
- ‘Service may be provided by commercial analog lines or via centrex (central Office exchange service, provided by a switch managed at the provider's central Office).’
- ‘IP Centrex and Hosted PBX services provide a valuable potential source of new revenue for service providers.’
- ‘Hosted IP Centrex is designed for customers that want all the features of a PBX or Key system without the associated capital, lease, or maintenance costs.’
1990s: blend of central and exchange.
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