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Asterisk is a complete PBX in software. It does voice over IP in three protocols, and interoperates with almost all standards-based telephony equipment using relatively inexpensive hardware. Asterisk provides Voicemail services with Directory, Call Conferencing, Interactive Voice Response, and Call Queueing. It also supports three-way calling, caller ID services, ADSI, MGCP, SIP and H.323 (as both client and gateway). The system needs no additional hardware for Voice over IP. Asterisk connects with digital and analog telephony equipment through a number of hardware devices, including that manufactured by Asterisk's sponsors, Digium. Digium has single and quad span T1 and E1 interfaces for interconnection to PRI lines and channel banks. An analog FXO card is available, and more analog interfaces are pending.


"IRC irc:// " IRC Help channel
"IRC irc:// " IRC development channel


Download version 11.7.0 (stable)
released on 17 December 2013

Technical support, consulting, and customization available from Digium, Inc. (

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Related Projects


LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey14 February 2003

Leaders and contributors

Resources and communication

Audience Resource type URI
Help Mailing List
Developer Mailing List
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Software prerequisites

Kind Description
Required to build Linux Kernel Sources
Required to build openssl
Weak prerequisite libpri (for T1 or E1 interfaces)
Required to use Linux kernel 2.4.x or later

This entry (in part or in whole) was last reviewed on 28 May 2008.


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