Browse free open source VoIP software and projects for Windows 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
A simple noise gate app intended for use with VOIPs like Skype.
Unified Communications Server
Java wrapper for the popular chat & VOIP service
Browse on Tor/i2p, Anon p2p Chat / FileTx, Conf / Video VoIP
A suite of open-source tools and frameworks for creating SIP apps
Modern, AI-Smart, WASTE p2p for ipv4, Tor and i2p + Voice Conference.
A command line utility for remote controlling Polycom VVX IP phones
This is a PBX dashboard showing the peer,queue,agent at real time
High performance, production quality STUN server and client library
H.323 Gatekeeper for VoIP and videconferencing
Positional Audio Communication for Minecraft with Mumble
Respins of various open source PBX projects
Java VoIP Softphone (SIP) (replaced by jfPhone)
Baresip is a modular SIP User-Agent with audio and video support
Send Asterisk CDR to serial device
VoIP/SIP Autodialer