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[[Image:asterisk.gif|174px|right|Asterisk official logo.]]
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'''[[Asterisk PBX]]''' is a [[free software]] / [[open-source software]] implementation of a telephone [[private branch exchange]] (PBX). Like any PBX, it allows a number of attached [[telephone]]s to make calls to one another, and to connect to other telephone services including the [[PSTN]]. "Its name comes from the asterisk symbol, *, which in [[Unix]] (including [[Linux]]) and [[DOS]] environments represents a wildcard, matching any filename." [http://www.digium.com/handbook-draft.pdf]
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Asterisk is released under a [[free software license]]: the [[GNU General Public License]] (GPL). [[Mark Spencer]] of [[Digium]] originally created Asterisk and remains its primary maintainer; dozens of other programmers have contributed features and functionality and have reported bugs. Originally designed for the [[Linux]] [[operating system]], Asterisk now also runs on [[OpenBSD]], [[FreeBSD]], [[Mac OS X]], [[Solaris Operating Environment|Sun Solaris]], and [[Microsoft Windows]], although as the "native" platform, Linux is the best-supported of these.