Alternatives to Flexisip for all platforms with any license

  • Asterisk

    Asterisk is free software that transforms a computer into a communication server. Asterisk lets you build applications like PBX, VoIP gateway, IVR and ACD.

    Free Open Source Mac Windows Linux

    Low level SIP Voice chat Add a feature

    Asterisk icon

  • FreeSWITCH

    FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using audio, video, text or any...

    Free Open Source Mac Windows Linux BSD

    Voice chat Add a feature

    FreeSWITCH icon

  • Kamailio

    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:...

    Free Open Source Linux

    SIP Add a feature

    Kamailio icon

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