Open-source PBX and telephony toolkit for building communications applications; modular C-based engine with SIP, WebRTC, RTP, ARI/AMI APIs and hardware support.

3.5k stars1.3k forkslast commit Actively maintained

Cloud business phone system providing VoIP calling, SMS, shared numbers, team inbox, voicemail, call recording, routing and analytics. Includes mobile/desktop apps, CRM integrations, API access and an AI receptionist for 24/7 call handling and summaries.
Open-source PBX and telephony toolkit for building communications applications; modular C-based engine with SIP, WebRTC, RTP, ARI/AMI APIs and hardware support.

3.5k stars1.3k forkslast 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 stars783 forkslast commit Actively maintained
Open-source, API-first platform for carrier-grade IP communications: VoIP, WebRTC, messaging, conferencing and programmable telephony microservices.

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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. 2 of 3 shipped a commit in the last six months. In exchange you take on hosting, backups and updates yourself.
Browse everything in VoIP / SIP & PBX.