Abstract
This chapter discusses how the Asterisk PBX (Private Branch Exchange) plays an important role in our day-to-day lives of communication. It reviews some key functionality of Asterisk PBX systems. . It studies some older PBX function technologies, such as analog and digital, as well as the new integrated Voice over Internet Protocol (VoIP)-enabled functions. It presents the benefits that IP-enabled PBX may have and its key differences from traditional voice technology. Asterisk is software running a PBX system that is freely available to anyone under the GNU General Public License (GPL).Asterisk provides all the functionality of VoIP and traditional telephony that any commercial PBX system would. Asterisk's features include conferencing, interactive voice response (IVR), voice mail, call parking, billing solutions, and much more. VoIP calls are transferred over packet-routed networks such as the Internet versus traditional circuit switched networks like the public switched telephone network (PSTN).
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