Free
Communication · SIP (telephony)
SIP/IPBX telephony software. · Category descriptions are the source's original text
Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
Routr
Lightweight SIP proxy, location server, and registrar for a reliable and scalable SIP infrastructure.
openSIPS
SIP proxy/server for voice, video, IM, presence and any other SIP extensions.
Flexisip
Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platform...
3CX
Full-featured PABX system, with call queues, built-in web conferencing, live chat and social media messaging all on one system.
Wazo
Full-featured IPBX solution built atop Asterisk with integrated Web administration interface and REST-ful API.
Yeti-Switch
Transit class4 softswitch(SBC) with integrated billing and routing engine and REST API.
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