Asterisk is an open source framework for building communications applications. Asterisk turns an ordinary computer into a communications server. Asterisk powers IP PBX systems, VoIP gateways, conference servers and other custom solutions. It is used by small businesses, large businesses, call centers, carriers and government agencies, worldwide. Asterisk is free and open source.
FreeSWITCH
FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using audio, video, text or any other form of media. It was built up in 2006 to fill the void left by proprietary commercial solutions. FreeSWITCH also provides a stable telephony platform on which many applications can be developed using a wide range of free tools.
sipXecs
sipXecs is an open source enterprise communications system. It was initially developed as a proprietary voice over IPtelephony server in 2003 by Pingtel Corporation in Boston, MA, and later extended with additional collaboration capabilities in the SIPfoundry project. Its core feature is a software implementation of the Session Initiation Protocol(SIP), which makes it an IP based communications system (IP PBX).
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