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
Unified Communications Server
A simple noise gate app intended for use with VOIPs like Skype.
Positional Audio Communication for Minecraft with Mumble
Java wrapper for the popular chat & VOIP service
Matrix reference homeserver
A suite of open-source tools and frameworks for creating SIP apps
http://www.vaakpbx.com
High performance, production quality STUN server and client library
H.323 Gatekeeper for VoIP and videconferencing
A command line utility for remote controlling Polycom VVX IP phones
OpenSource Call Center and Dialer System
Respins of various open source PBX projects
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.