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a telephone that shows which line is in use. PBX Private Branch eXchange An in-house telephone switching system that interconnects telephone extensions to each other as well as to the outside telephone network. DID Direct Inward Dialing The ability to make a telephone call directly into an internal extension without having to go through the operator. PRI Primary Rate Interface An ISDN service that provides 23 64-Kbps B (Bearer) channels and free internet service providers, internet service providers freeinternet service providers, free, free internet service providers
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