Telephone service enhanced features

telephone call with several participants

service that sends phone caller's number to the recipient of the phone call

communication process

technology that allows interactions on a telephone and a computer to be coordinated

a telephone service

thumb|Typical standard phone used with Centrex. Note the "Recall" button and the Message Waiting Lamp.Centrex is a portmanteau of central exchange, a kind of telephone exchange. It provides functions similar to a PBX, but is provisioned with equipment owned by, and located at, the telephone company premises.