Browse free open source VoIP software and projects for Linux 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
A simple noise gate app intended for use with VOIPs like Skype.
Unified Communications Server
Java wrapper for the popular chat & VOIP service
Matrix reference homeserver
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.
http://www.vaakpbx.com
Java VoIP Softphone (SIP) (replaced by jfPhone)
H.323 Gatekeeper for VoIP and videconferencing
High performance, production quality STUN server and client library
A suite of open-source tools and frameworks for creating SIP apps
Java VoIP/SIP PBX system (replaced by jfPBX)
Positional Audio Communication for Minecraft with Mumble
Baresip is a modular SIP User-Agent with audio and video support