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Asterisk PBX

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Asterisk PBX

Open source PBX software that runs under Linux and other Unix variants on a variety of hardware, including x86, PowerPC, POWER and Xscale. Supporting traditional telephony (TDM) as well as voice over IP (VoIP), Asterisk is written in C and uses the Unix standard POSIX programming interface to communicate with the operating system.

The IAX Protocol
Asterisk uses its proprietary Inter-Asterisk Exchange (IAX) protocol to initiate calls and send the data. Supporting any type of codec, IAX can be used for video as well as VoIP. All signaling and data ride in UDP packets, and IAX can multiplex multiple data streams between servers (port aggregation).

From Digium Et Al
Developed by Mark Spencer of Digium, Inc. (www.digium.com) and maintained by the company along with the Asterisk community (www.asterisk.org), a version for Windows that supported only VoIP was developed as a community project, but "AstWind" was later abandoned. Digium also offers a variety of analog and digital telephony interface cards that plug into PCI slots.



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Founded in January 2005 as a consultancy specializing in implementation of open source technologies, Two Heads has built a business on successful implementations of popular open source projects like the Asterisk PBX, Bacula network backup, and Pentaho business intelligence.
Italian Financial Firm Unionfidi Deploys Pentaho for Enterprise ... by Business Wire
Any business using the free Asterisk PBX software, or other premium PBX solutions, can also boost savings and workforce efficiency with access to high-end features previously only available to large businesses.
Gizmo Project for Business Debuts; All Calls Free Plan Plus Asterisk ... by Business Wire
ISS X-Force has discovered a denial of service vulnerability in the IAX2, which is used by Asterisk PBX to exchange Voice over Internet Protocol (VoIP) and call content.
Internet Security Systems Discovers and Provides Preemptive ... by Business Wire
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