VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Issabel PBX - Unified Communications
ICTCore: Unified Communications Framework for web developers
SMS, Fax, Voice Broadcasting and auto dialer Software
Unified Communications Server
Unified Communications System - PBX System
Java VoIP Softphone (SIP) (replaced by jfPhone)
VoIP/SIP Autodialer
Accent interfaces and controls systems through goals and policies
SIP softphone
SIP Video Multiconference Media Server with WebRTC support.
Callflow Sequence Diagram Generator
Java VoIP/SIP PBX system (replaced by jfPBX)
Simple and efficient tool for SIP trace filtering
Baresip is a modular SIP User-Agent with audio and video support
This project has been relocated to http://github.com/sippy/rtpproxy h
Small and effective program for SIP traces anonymization