Asterisk is a free and open source framework for building communications applications. Asterisk powers IP PBX systems, VoIP gateways, and conference servers, and is used by SMBs, enterprises, call centers, carriers and governments worldwide. It operates as an engine that handles all of the low-level details of initiating, maintaining and manipulating calls between endpoints (phones). Asterisk is free and open source and is used by small businesses, large businesses, call centers, carriers and government agencies, worldwide. Ever since its release, Asterisk has been tested and refined by a community of more than 80,000 developers and integrators in 170 countries around the world.
Asterisk permits system administrators and application developers to swiftly and effortlessly accumulate communications solutions, including IP PBX systems, interactive voice response (IVR) servers, voice messaging platforms, automatic call distributors (ACD), and more. Asterisk includes a wide range of building block modules that handle the low-level details of telecommunications, leaving the developer free to focus on business logic. Asterisk is incredibly powerful, includes support for virtually every communications protocol in use today, and offers unparalleled flexibility.