Alternatives to Flexisip for all platforms with any license

Platforms

Desktop

Indie / Classic

  • Asterisk icon

    Asterisk

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

    Open Source Mac Windows Linux

  • FreeSWITCH icon

    FreeSWITCH

    FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication...

    Open Source Mac Windows Linux BSD

  • kamailio icon

    kamailio

    Kamailio® (successor of former OpenSER and SER) is an Open Source SIP Server released under GPL, able to handle thousands of call...

    Open Source Linux

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