freepbx
Asterisk
FreeSWITCH
FusionPBX
Wazo.io
Kamailio
miniSIPServer
XiVO
SimpleX
freepbx
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Asterisk - An open source telephony switching and private branch exchange service for Linux.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.
Wazo.io - The UCaaS Platform Built for MSPsโ
Kamailio - Kamailioยฎ (successor of former OpenSER and SER) is an open source SIP server released under...
miniSIPServer - Social & Communications and Development