FreeSWITCH
FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using audio, video, text or any other form of media.
The Taridium ipbx is a complete software-based VoIP PBX system that replaces traditional proprietary hardware PBX. ipbx runs on an open source operating system (Linux)...
the taridium ipbx is a complete softwarebased voip pbx system that replaces traditional proprietary hardware pbx. ipbx runs on an open source operating system (linux) without the need for extra software licenses and is based on the sip standard. choose from many sip based hardware phones such as aastra, cisco, polycom or linksys, instead of getting locked in with one vendor.
now also on your iphone: http://www.taridium.com/business/mobile
voice-chat sip enterprise pbx asterisk ip-pbx
FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using audio, video, text or any other form of media.
Free Open Source Mac OS X Windows Linux BSD
Yate is a softswitch (concept of separating the network hardware from network software). It supports VoIP protocols: H.323, SIP, IAX1, IAX2, RTP. For the plain old telephony systems (PSTN) it supports ISDN BRI and PRI.
Free Open Source Linux
PBX in a Flash is a PBX system based on Asterisk, FreePBX and CentOS, coming as an ISO download. A two stage installation process allows for more flexibility for the...
Free Open Source Linux
FreeSentral is a full IP PBX consisting of a Linux Distribution, an IP PBX and a Web Graphical User Interface for easy configuration
Free Open Source Mac OS X Windows Linux
Incredible PBX is a secure and feature-rich implementation of the Asterisk® PBX. By rethinking the PBX security model from the ground up.
Free Open Source Linux Raspberry Pi Raspbian