The name Asterisk refers to the “*” symbol which is a “wildcard” in Unix and DOS command line syntax, denoting a symbol of a very versatile component in a voice network. Like any PBX, it allows a number of attached telephones to make calls to one another, and to connect to other telephone services including the PSTN, ISDN or to a VoIP provider. Asterisk is an open-source software implementation of a PBX (Private branch exchange).
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