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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.
Asterisk - An open source telephony switching and private branch exchange service for Linux.
Elastix - Elastix is an open source Unified Communications Server software that brings together IP PBX...
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.
freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
FreeSENTRAL - FreeSentral is a full IP PBX consisting of a Linux Distribution, an IP PBX and a Web Graphical User...