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 OS X Windows Linux Low level Add a feature 31 Like
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 No features added Add a feature 16 Like
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 Voice Call Add a feature 7 Like
Wazo Wazo is a unified communications platform based on Asterisk and focused on extensibility. Free Open Source Mac OS X Windows Linux Self-Hosted Extensible by Plugins/Extensions Add a feature 5 Like
3CX Phone System 3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such as Google Nexus, Sony Xperia, Motorola Droid or Samsung Galaxy. Connect... Freemium Windows Android iPhone No features added Add a feature 8 Like
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 OS X Windows Linux BSD No features added Add a feature 12 Like
FreeSENTRAL 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 No features added Add a feature 3 Like
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 OS X Windows Android iPhone Unified messaging Add a feature 2 Like
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 No features added Add a feature 3 Like
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 No features added Add a feature 4 Like
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 No features added Add a feature 1 Like
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 No features added Add a feature 8 Like
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 No features added Add a feature 4 Like
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 No features added Add a feature 2 Like
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 No features added Add a feature 6 Like
