Asterisk source
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
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Self-hosted Communication - SIP software (2026)
[SIP](https://en.wikipedia.org/wiki/Session_Initiation_Protocol)/[IPBX](https://en.wikipedia.org/wiki/IP_PBX) telephony software.
12 open-source apps · all free & self-hostable
Flexisip source
Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground.
Freepbx source
Web-based open source GUI that controls and manages Asterisk.
FreeSWITCH source
Scalable open source cross-platform telephony platform.
FusionPBX source
Web interface for multi-platform voice switch called FreeSWITCH.
Kamailio source
Modular SIP server (registrar/proxy/router/etc).
openSIPS source
SIP proxy/server for voice, video, IM, presence and any other SIP extensions.
Routr source
Lightweight SIP proxy, location server, and registrar for a reliable and scalable SIP infrastructure.
SIP3 source
VoIP troubleshooting and monitoring platform.
SIPCAPTURE Homer source
Troubleshooting and monitoring VoIP calls.
Wazo source
Full-featured IPBX solution built atop Asterisk with integrated Web administration interface and REST-ful API.
Yeti-Switch source
Transit class4 softswitch(SBC) with integrated billing and routing engine and REST API.