Digium® is the innovative force behind Asterisk®, the world's most widely used open source telephony platform. In addition, Digium develops the software, hardware, and other components you'll need to create a unified communications solution for a small or medium business.Asterisk is a software development platform that powers IP PBX systems, VoIP gateways, conference servers. Switchvox is an affordable business phone system that includes UC and call center features. More..