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Website | freepbx.org |
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Website | fusionpbx.com |
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Asterisk - An open source telephony switching and private branch exchange service for Linux.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
3CX Phone System - 3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such...
Kamailio - Kamailio® (successor of former OpenSER and SER) is an open source SIP server released under...
VitalPBX - VitalPBX is a full-feature PBX (phone system) based on Linux and Asterisk.
Wazo.io - The UCaaS Platform Built for MSPs