FreeSWITCH
Scalable open source cross-platform telephony platform.
Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
Kamailio
Modular SIP server (registrar/proxy/router/etc).
SIPCAPTURE Homer
Troubleshooting and monitoring VoIP calls.
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.
FusionPBX
Web interface for multi-platform voice switch called FreeSWITCH.
Flexisip
Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text m…
Freepbx
Web-based open source GUI that controls and manages Asterisk.
SIP3
VoIP troubleshooting and monitoring platform.
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.