Roll Your Own PBX in an Hour or TwoAug 15, 2008, 20:32 (2 Talkback[s])
(Other stories by John Rogers)
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"A PBX or “Private Branch Exchange” is like a miniature phone company/switch in your own office/house. The PBX is responsible for making sure calls are routed properly. Situation: when Joe wants to dial Suzy in the office down the hall or downstairs in the TV room, he just picks up the phone in his room/office and dials a local extension just a few digits long. If he wants to call someone across town or around the world, he dials an “outside line” prefix (usually a 9) plus the desired number and the PBX routes his call to the PSTN (Public Switched Telephone Network) just like any other dialed call. Also, if Joe has four teenaged kids, instead of answering their calls and acting as the house receptionist, he can just setup a menu that allows callers to dial the person they want and then needs not be disturbed."
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