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RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
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
Thinking Phones - Unified Communications in the Cloud
Comwave Business - Comwave is an online hosted PBX IP phone system providing software that allows small business to develop their communication system to enhance the relationship among clients.
Grasshopper - Grasshopper enables entrepreneurs to build a virtual office that connects callers to employees, wherever they are.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.