FreeSWITCH is an open-source software-defined telecom stack for building VoIP and real-time communication services with SIP and WebRTC support.
5k stars1.8k forkslast commit Actively maintained
8 self-hosted 3CX alternatives
Cloud-hosted VoIP PBX and unified communications platform for businesses, offering SIP telephony, IVR, call queues, voicemail, call recording, SIP trunking, web/video conferencing, presence, and desktop/mobile apps with CRM integration.
Alternatives to 3CX
#2
Open-source PBX and telephony toolkit for building communications applications; modular C-based engine with SIP, WebRTC, RTP, ARI/AMI APIs and hardware support.
3.4k stars1.3k forkslast commit Actively maintained
#3
Kamailio is an open source SIP signaling server for scalable VoIP and real-time communication platforms, supporting routing, load balancing, WebRTC, and IMS/VoLTE.
2.9k stars1.1k forkslast commit Actively maintained
#4
Routr is a programmable SIP server (proxy/registrar/location) for building scalable VoIP infrastructure with APIs, multi-tenancy, and Kubernetes-ready deployment.
1.7k stars179 forksMITlast commit Actively maintained
FusionPBX is a domain-based, multi-tenant PBX and softswitch web UI for FreeSWITCH, supporting extensions, IVR, queues, voicemail, provisioning, and more.
1k stars776 forkslast commit Actively maintained
#6
Open-source, modular SIP server (proxy, presence, conference, B2BUA) with push gateway, ICE/STUN/TURN, MySQL/SQLite support; optimized for mobile and embedded systems.
185 stars83 forksAGPL-3.0last commit Actively maintained
#7
Modular, PHP/JavaScript web GUI that configures and manages Asterisk PBX features, endpoints, and call routing for businesses and service providers.
Activity unknown
Open-source, API-first platform for carrier-grade IP communications: VoIP, WebRTC, messaging, conferencing and programmable telephony microservices.
Activity unknown
What replacing 3CX actually involves
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 6 of 8 shipped a commit in the last six months. Licences in this list: MIT, AGPL-3.0. In exchange you take on hosting, backups and updates yourself.
Browse everything in VoIP / SIP & PBX.
