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FreeSWITCH is an open-source VoIP platform that helps build scalable communication systems. It lets users create telephony apps with a high-performance cross-platform solution. FreeSWITCH can be easily integrated into existing systems and supports various communication protocols, including SIP, WebRTC, PSTN (Public Switched Telephone Network), and many custom APIs. Since it's free to use and modify under the MPL license, FreeSWITCH is suitable for small startups as well as large enterprises looking to improve their communications infrastructure while avoiding hefty licensing fees associated with proprietary platforms.

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