Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)

Jitsi is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, IRC and many other useful features.

WebRTC plugin for Flutter Mobile/Desktop/Web

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware. From a Raspberry PI to a multi-core server, FreeSWITCH can unlock the telecommunications potential of any device.

RTSP/RTP/RTMP/FLV/HLS/MPEG-TS/MPEG-PS/MPEG-DASH/MP4/fMP4/MKV/WebM

Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms -

The official Asterisk Project repository.

🏆 WebRTC - SFU - Simple, Secure, Scalable Real-Time Video Conferences Up to 8k, compatible with all browsers and platforms.

PJSIP project

A simple, intuitive, and powerful JavaScript signaling library

Baresip is a modular SIP User-Agent with audio and video support

HOMER - 100% Open-Source SIP, VoIP, RTC Packet Capture & Monitoring

A WebRTC, SIP and VoIP library for C# and .NET. Designed for real-time communications apps.

⚡ The future of programmable SIP servers.

Linphone.org mirror for linphone-android (https://gitlab.linphone.org/BC/public/linphone-android)

SIP softphone for Mac

Ncurses SIP Messages flow viewer

Pluggable WebRTC softphone and communication platform.

SIPVicious OSS is a VoIP security testing toolset. It helps security teams, QA and developers test SIP-based VoIP systems and applications. This toolset is useful in simulating VoIP hacking attacks against PBX systems especially through identification, scanning, extension enumeration and password cracking.

A Go implementation of STUN