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Introduction to the Asterisk Open Source PBX

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Introduction to the Asterisk Open Source PBX
Introduction to the Asterisk Open Source PBX http://asterisk.org Mark Spencer
Linux Support Services, Inc. http://www.linux-support.net Presented first at Libre Software Meeting 2002 Bordeaux, France July 9, 2002

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Introduction to Asterisk Asterisk is a fully Open Source, hybrid TDM and packet voice PBX and IVR platform. Asterisk is and has been Open Source under GNU GPL (with an exception permitted for linking with the OpenH323 project, in order to provide H.323 support). Commercial licensing is available from Linux Support Services, Inc. (http://www.linux-support.net) for applications in which the GPL is inappropriate. Unlike many modern "soft switches", Asterisk can use both traditional TDM technology and packet voice (Voice over IP and Voice over Frame Relay) protocols. Calls switched on TDM interfaces provide lag-less TDM call quality, while retaining interoperability with VoIP packetized protocols. Asterisk acts as a full featured PBX, supporting virtually all conventional call features on station interfaces, such as Caller*ID, Call Waiting,Caller*ID on Call Waiting, Call Forward/Busy, Call Forward/No Answer, Call Forward Variable, Stutter Dialtone, Three-way Calling, Supervised Transfer, Unsupervised Transfer, ADSI enhancements, Voicemail, Meet-me Conferencing, Least Cost Routing, VoIP gatewaying, Call Detail Records, etc. At the same time, Asterisk provides full IVR capability, programmable at several layers, from a low-level C interface, to high level AGI scripting (analogous to CGI) and extension logic interfaces. Asterisk IVR applications run seamlessly from one interface to another, and need not know anything about the physical interface, protocol, or codec of the call they are working with, since Asterisk provides total abstraction for all those concepts. Supported Hardware Asterisk supports a variety of hardware interfaces for bringing in telephony channels to a Linux box. In order of best supported to least supported: Zaptel (Zapata
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