Asterisk is an open source framework for building communications applications. It powers IP PBX systems, VoIP gateways, conference servers and more, and is used by small businesses, large businesses, call centers, carriers and governments worldwide. Asterisk is free and open source.
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VICIDIAL is a set of programs that are designed to interact with the Asterisk Open-Source PBX Phone system to act as a complete inbound/outbound call center suite.