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Open Source Telephony

Asterisk

Asterisk is an open source framework for building communications applications.

dSIPRouter

SIP Service Provider platform using Kamailio, FusionPBX, or FreePBX.

drachito

The Node.js framework for SIP server applications.

FreePBX

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

FreeSWITCH

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware.

FusionPBX

FusionPBX can be used as a highly available single or domain based multi-tenant PBX, carrier grade switch, call center server, fax server, voip server, voicemail server, conference server, voice application server, appliance framework and more.

HOMER

HOMER is part of the SIPCAPTURE stack: A robust, carrier-grade and modular VoIP and RTC Capture Framework for Analysis and Monitoring with native support for all major OSS Voice platforms and vendor-agnostic Capture agents.

jambonz

jambonz is the open source CPaaS built for communications service providers.

Janus

Janus is a WebRTC Server developed by Meetecho conceived to be a general purpose one.

Jitsi

Multi-platform open-source video conferencing

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.

OpenSIPS

OpenSIPS is an Open Source SIP proxy/server for voice, video, IM, presence and any other SIP extensions.

Pion

The Modern Stack for Web Real-Time Communication.

PJSIP

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE.

Sofia SIP

Sofia-SIP - a RFC3261 compliant SIP User-Agent library.