FreeSWITCH
Open SourceFreeSWITCH is a highly flexible and scalable open-source software development platform for real-time communication. It enables the creation of Voice over IP (VoIP), WebRTC, telecommunications, and video chat applications.
Key Features
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Highly Flexible and Customizable Architecture
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Extensive Protocol Support (SIP, WebRTC, etc.)
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Excellent Scalability for Large Deployments