Video conferencing and collaboration platform
Open-source event-driven AI powered Softphone
Issabel PBX - Unified Communications
VoIP/SIP SoftPhone (formerly known as jphonelite)
Unified Communications Server
Unified Communications System - PBX System
Jitsi is an audio/video and chat communicator that supports protocols
Java VoIP Softphone (SIP) (replaced by jfPhone)
VoIP/SIP Autodialer
A Better PBX For Your Business
Accent interfaces and controls systems through goals and policies
Enterprise telephony recording and retrieval system
Java VoIP/SIP PBX system (replaced by jfPBX)
This project has been relocated to http://github.com/sippy/rtpproxy h
Baresip is a modular SIP User-Agent with audio and video support
A multi-protocol instant messaging app for Mac OS X