Browse free open source VoIP software and projects below. Use the toggles on the left to filter open source VoIP software by OS, license, language, programming language, and project status.
Issabel PBX - Unified Communications
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Unified Communications Server
A simple noise gate app intended for use with VOIPs like Skype.
Java wrapper for the popular chat & VOIP service
http://www.vaakpbx.com
Browse over Tor/i2p, Anon p2p Chat/FileTx, p2p ConfVideoVoIP
OpenSource Call Center and Dialer System
High performance, production quality STUN server and client library
Java VoIP Softphone (SIP) (replaced by jfPhone)
Positional Audio Communication for Minecraft with Mumble
SIP Video Multiconference Media Server with WebRTC support.
VoIP/SIP Autodialer
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.