Scalable open source cross-platform telephony platform. (Source Code) MPL-2.0 C
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Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground. (Source Code) AGPL-3.0 C/Docker
Easy to use but advanced IP PBX system, VoIP gateway and conference server. (Source Code) GPL-2.0 C/deb
Troubleshooting and monitoring VoIP calls. (Source Code) AGPL-3.0 Nodejs/Go/Docker
Full-featured IPBX solution built atop Asterisk with integrated Web administration interface and REST-ful API. (Source Code) GPL-3.0 Python