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
Unified Communications Server
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
A simple noise gate app intended for use with VOIPs like Skype.
Browse on Tor/i2p, Anon p2p Chat / FileTx, Conf / Video VoIP
Java wrapper for the popular chat & VOIP service
http://www.vaakpbx.com
Matrix reference homeserver
OpenSource Call Center and Dialer System
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.
Java VoIP Softphone (SIP) (replaced by jfPhone)
High performance, production quality STUN server and client library
Positional Audio Communication for Minecraft with Mumble
Callflow Sequence Diagram Generator
For more VoIP resources for business, take a look at the business VoIP category.