Free Software Foundation!

Join now


From Free Software Directory
Revision as of 20:13, 6 February 2014 by Duthils (Talk | contribs)

Jump to: navigation,

Telephony system

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 11.25.1 (stable)
released on 8 December 2016

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

VCS Checkout


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
Support Mailing List

Software prerequisites

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

This entry (in part or in whole) was last reviewed on 23 December 2016.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

Personal tools