Asterisk is software; similar, if not what runs on most phone systems, allowing connected telephones to make calls to one another and to other telephone services over both standard public switched telephone network (PSTN) lines and the Internet using Voice over Internet Protocol (VoIP) services.
Asterisk is available as an open source FREE solution and as a GNU General Public License (GPL) to be modified and sold as a commercial solution.
With an on premise server and using virtualisation, it costs nothing to create a VOIP Phone Server built on Asterisk and with SIP trunking and fast broadband, voice call pricing can be slashed. We can provide both the Asterisk installation, configuration and support within our standard support services and can provide low cost call options using our own voice packages.