Free, easy to setup PBX for small business based on Asterisk 16 core

Katari - Python Session Initiated Protocol Framework

Dockerized FreePBX 15 w/Asterisk 17, Seperate MySQL Database support, and Data Persistence and UCP

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

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

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.

A fully featured browser based WebRTC SIP phone for Asterisk

Routr: Next-generation SIP Server

HOMER 7.x Front-End and API Server

FreePBX container (Asterisk 16; OpenPBX 15 with Backup and IVR modules installed)

📡 A curated list of awesome Real Time Communications resources

Kalbi - Golang Session Initiated Protocol Framework

Set of tools to audit SIP based VoIP Systems

IVOZ Provider - Multitenant solution for VoIP telephony providers

Modern .NET Standard client for accessing the Asterisk AMI protocol using async/await and Reactive Extensions (Rx)

Ansible scripts to install and configure SIP3

Generic library for real-time communications with async IO support

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

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

Linphone is a free VoIP and video softphone based on the SIP protocol. Mirror of linphone-iphone (git://git.linphone.org/linphone-iphone.git)