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Asterisk is an open source PBX written by Mark Spencer that is available for free download. A free beta trial version of a simplified version called AsteriskNow also is available.

The software supports a stand-alone PBX or can function as a gateway between older TDM PBXs and IP networks. It includes features such as voice mail, conferencing, call distribution and voice phone menus, among many, many others.

Asterisk runs on Linux, Solaris, Mac OS and NetBSD, FreeBSD and OpenBSD servers.

The platform supports SIP, MGCP, H.323 and the Inter-Asterisk Exchange protocols.

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Posted by Gkkrishna

What Is Asterisk
Asterisk is an open source PBX (private branch exchange) that provides all the functionality of high-end business telephone systems, and much more. It is the world's most flexible and extensible telephone system, providing many features that are not yet available in even the most advanced proprietary systems. It is also the world's cheapest telephone system. The software is free and runs on inexpensive Linux servers

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Posted by sagitraz