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RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
freepbx - FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
Switchvox - Find the perfect phone system for your business. Digium’s business phone systems are available in the cloud and on-premises, with all features included
Asterisk - An open source telephony switching and private branch exchange service for Linux.
Grasshopper - Grasshopper enables entrepreneurs to build a virtual office that connects callers to employees, wherever they are.
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.