Linphone is likely to be the first open source SIP-based conferencing solution powered by a modern SFU server.
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An open source SIP phone for voice/video calls and instant messaging (mobile and desktop)
A high-level VoIP library implementing all SIP calling and IM features within a single API
A SIP server implementation with proxy, presence and conference modules
A web API, provisioning server and admin platform for the creation and management of user accounts
End-to-end encryption module for instant messaging, implementing the Signal Protocol
A Linphone extension providing Post Quantum Cryptography (using the Crystals-KYBER algorithm)
A powerful voice/video streaming engine for telephony apps & a C library implementing RTT Protocol
A VoIP anti-blocking solution to overcome VoIP blocking and firewall restrictions
A fully portable C99 implementation of both an encoder and decoder for the G.729 A/B codec