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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.
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.
Kamailio - Kamailio® (successor of former OpenSER and SER) is an open source SIP server released under...
3CX Phone System - 3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such...
miniSIPServer - Social & Communications and Development