Linphone
Open SourceLinphone is a free and open-source Voice over IP (VoIP) application and SIP client available on multiple platforms. It enables encrypted voice and video calls, instant messaging, and file sharing, offering a privacy-focused communication solution.
Key Features
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Free and open-source with strong privacy features
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Supports end-to-end encryption for calls and chat
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SIP standard compliant, allowing connection to various VoIP providers