Centrex

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Telephone exchange service

title: "Centrex" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["telephone-service-enhanced-features", "telephone-exchanges"] description: "Telephone exchange service" topic_path: "general/telephone-service-enhanced-features" source: "https://en.wikipedia.org/wiki/Centrex" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Telephone exchange service ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/b/b2/ATTtelephone-large.jpg" caption="language=en}}"] ::

Centrex service was first installed in the early 1960s in New York's financial district by New York Telephone. As of 2003, it was estimated that there were 20 million Centrex lines installed worldwide by 20 telephone companies, with the most installations in the United States (15 million), Canada (2 million), and the United Kingdom (1 million). This accounted for approximately 5% of all installed business telephone lines, worldwide.

In terms of user-visible features, Centrex and PBX are similar. Features include:

Phasing out

In the United States, the usage of Centrex lines has fallen from 16.5 million in 2002 to 10.7 million in 2008 as users transition to IP-PBX (through VoIP). Centrex continues to be used by large institutions, government agencies, and universities as most of the equipment has already been paid for, though leasing Centrex lines may be more expensive.

References

References

  1. Wittenberg, Nicholas. (2009-02-19). "Understanding Voice Over IP Technology". Cengage Learning.
  2. (2003). "Centrex Or PBX: The Impact of IP". Artech House.
  3. (2016-07-09). "Telephony 101: Centrex".
  4. Horak, Ray. (2012-11-19). "Telecommunications and Data Communications Handbook". John Wiley & Sons.
  5. Reed, Brad. (February 13, 2012). "Centrex: It's alive (for now)!". Network World.
  6. (2009). "TIA'S 2009 ICT MARKET REVIEW AND FORECAST". The Telecommunications Industry Association.

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telephone-service-enhanced-featurestelephone-exchanges