Asterisk

Asterisk is an open-source framework for building private branch exchanges (PBXs) and unified communications systems, allowing developers to create custom telephony applications and integrate voice, video, and messaging services. As a versatile and widely-used platform, Asterisk is relevant to the tech community for its ability to enable businesses and organizations to manage their communications infrastructure efficiently and cost-effectively, while also providing a foundation for innovative VoIP and UC solutions.