PJSIP - Open Source SIP, Media, and NAT Traversal LibraryMetal renderer for MacOS & iOS Windows Schannel TLS backend Dialog Event subscription (client only) Lyra codec PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. It combines signaling protocol (SIP) with rich multimedia framework and NAT traversal functionality into high level API
