centrex
/ˈsɛntrɛks/
noun
- A telephone exchange service provided by a phone company that allows a business to have its own private branch exchange features without owning the equipment.
- The IT department configured the centrex system to handle over 200 extensions.
- With centrex, we can transfer calls and set up conference lines without extra hardware.
- Our company uses centrex for all internal and external phone calls.