3 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.

• AsteriskSelf-hosted / open source

  Asterisk 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.

  United States · owner in Canada

• KamailioSelf-hosted / open source

  Open-source SIP server for VoIP, WebRTC and real-time communications

  Germany

• WazoSelf-hosted / open source

  Open-source unified communications platform built on Asterisk

  France