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.

Free Open Source Mac OS X Windows Linux BSD

Elastix

Elastix is an open source Unified Communications Server software that brings together IP PBX, email, IM, faxing and collaboration functionality.

Freemium Linux

Yate - Yet Another Telephony Engine

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

AsteriskNOW

AsteriskNOW is the fastest way to get started building custom telephony solutions with Asterisk. Simply download the .iso file, burn it to a CD, drop it into the CD or...

Free Linux

Wazo

Wazo is a unified communications platform based on Asterisk and focused on extensibility.

Free Open Source Mac OS X Windows Linux Self-Hosted

XiVO

XiVO is an IP-PBX, a unified communications platform that connects phones on a local or private network with other networks such as public landlines and mobile...

Free Open Source Mac OS X Windows Linux

PBX in a Flash

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

The Incredible PBX

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

Taridium ipbx

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)...

Freemium Linux iPhone