Flexisip is described as 'SIP proxy server implementation compliant to RFC3261, written in C++11 started in 2011' and is an app in the social & communications category. There are four alternatives to Flexisip for a variety of platforms, including Linux, BSD, Mac, Windows and Cygwin apps. The best Flexisip alternative is Asterisk, which is both free and Open Source. Other great apps like Flexisip are FreeSWITCH, Yate - Yet Another Telephony Engine and Kamailio.
Asterisk is an open source framework for building communications applications. Asterisk turns an ordinary computer into a communications server. Asterisk powers IP PBX systems, VoIP gateways, conference servers and other custom solutions.
FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using audio, video, text or any other form of media. It was created in 2006 to fill the void left by proprietary commercial solutions.
Yate is a softswitch (concept of separating the network hardware from network software).
Kamailio® (successor of former OpenSER and SER) is an open source SIP server released under GPL, able to handle thousands of call setups per second. Among features: asynchronous TCP, UDP and SCTP, secure communication via TLS for VoIP (voice, video); WebSocket support for...
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