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Asterisk - An open source telephony switching and private branch exchange service for Linux.
VirtualPBX - VirtualPBX provides hosted VoIP PBX phone services that give small and medium growing businesses a professional, fully automated call answering and routing solution
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.
Mitel - Business Communications and Collaboration
FusionPBX - FusionPBX is an open source FreeSWITCH GUI.
The Real PBX - Power your business communication with The Real PBX's Hosted PBX, toll-free number and cloud telephony services. Free trial and 24x7 support available.