6 open-source Telephony & VoIP vendors
Open-source software for Telephony & VoIP that you can self-host, with auditable source code — regardless of the developer's headquarters.
- vendors scored
- 6
- European
- 3
- foreign-owned
- 1
- last checked
- 11 October 2026
Vendors, scored
Score per vendor: 0 = high exposure, 100 = sovereign
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- Sovereignty score 94 out of 100KamailioGermany · Self-hosted / open sourceOpen-source SIP server for VoIP, WebRTC and real-time communications
- Sovereignty score 94 out of 100OpenSIPSRomania · Self-hosted / open sourceOpen-source SIP server for voice, video and messaging, maintained by OpenSIPS Solutions in Bucharest; self-hostable
- Sovereignty score 94 out of 100WazoFrance · Self-hosted / open sourceOpen-source unified communications platform built on Asterisk
- Sovereignty score 77 out of 100FreePBXCanada · Self-hosted / open sourceOpen-source web interface for managing Asterisk telephony, maintained by Sangoma and released under GPL-3.0; runs on your own server.
- Sovereignty score 71 out of 100AsteriskUnited States · Self-hosted / open source · owner in CanadaAsterisk is an open-source PBX and telephony toolkit originally created by Mark Spencer at Digium, Inc. (Huntsville, Alabama, USA) in 1999. Digium was acquired by Canadian company Sangoma Technologies Corporation (Markham, Ontario) in 2018, making Sangoma (CA) the current sponsor and ultimate parent. The project has no German connection; the catalog's recorded DE/EU/eu-strict classification is incorrect.
- Sovereignty score 69 out of 100FreeSWITCHUnited States · Self-hosted / open sourceOpen-source platform for real-time voice and video under the MPL licence, maintained by SignalWire of Palo Alto; can run on your own servers.
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