Asterisk

Asterisk is free software that transforms a computer into a communication server. Asterisk lets you build applications like PBX, VoIP gateway, IVR and ACD.

Free Open Source Mac Windows Linux

FreePBX

FreePBX is a web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server.

Free Open Source Linux

MicroSIP

MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack. It allowing to do high quality VoIP calls (P2P or on regular telephones) via open SIP...

Free Open Source Windows PortableApps.com

Wazo

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

Free Open Source Mac Windows Linux Self-Hosted

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...

Free Open Source Mac Windows Linux BSD

3CX Phone System

3CX is a software-based, open standards IP PBX that offers complete Unified Communications, out of the box.

Freemium $ $ $ Mac Windows Linux Web Android ... iPhone Microsoft Exchange Server Chrome Microsoft Office Suite Firefox

FusionPBX

FusionPBX is an open source FreeSWITCH GUI. FusionPBX can be used as a high available single or domain based multi-tenant PBX, carrier grade switch, call center server...

Free Open Source Linux BSD

Kamailio

Kamailio® (successor of former OpenSER and SER) is an open source SIP server released under GPL, able to handle thousands of call setups per second. Among features:...

Free Open Source Linux

Starfish PBX

Starfish PBX aims to be an open source alternative to Digium’s Switchvox. The goal is to have a software equivalent to which we can add additional functionality like: ...

Free Open Source Linux

RingCentral Engage Digital

Leading brands use RingCentral Engage Digital SaaS software applications to make it easier to manage their online customer service activities. Our clients enjoy lower...

Commercial Open Source Mac Windows Web Android iPhone ... Windows Phone

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...

• It is for Linux only, not Windows. Guest • Jan 2016 Disagree   Agree

Free Open Source Mac Windows Linux

RingCentral

RingCentral delivers high quality, reliability and value that's expected by enterprise businesses through RingCentral Office, an all-inclusive cloud phone system...

Commercial Mac Windows Android iPhone

Elastix

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

Freemium Linux

unxsVZ uSIPSwitch

uSipSwitch a micro sip switch (sip proxy) perfect for edge SIP SBC work (e.g. hosted PBX business). Comes with web console and DNS health tools. Uses modern clustering...

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