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IP telephony that enables a caller with a PSTN phone number to locate the destination device and establish a session. BLI Busy Lamp Indicator A light or LED on 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 business isp, isp businessisp, business, business isp
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