What is an open source IVR?

Asterisk is the world’s most popular open source communications project that lets you create telephony apps for IP PBXs, VoIP Gateways and Conference Servers. 2. ICTDIALER ICTDialer is bundled with free and open source web-based IVR designer that can design your IVR through interactive, graphical, drag and drop feature. 3. CALLBUTLER.CODEPLEX
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