CornerStone, a respected partner, delivers comprehensive communication solutions and innovative technologies aligned with customer’s organizational objectives. We are driven to enhance the customer experience through quality products and accessible, knowledgeable resources.

We pride ourselves in being an advanced communications solutions provider, specializing in services for middle market business and enterprise customers.

Our mission is to serve our clients by providing reliable business communications solutions from a proven telecommunications partner, including telephone, Internet, hosting, data center and cloud computing services. We offer our clients the best software and networks available, all supported by unrivaled customer service and technical support teams.

With over 50,000 access lines, providing local and long distance telephone service, high-speed Internet access, VoIP, security services and business telephone systems, CornerStone is your proven telecommunications partner with a track-record of increasing end-user productivity and reducing clients’ operating costs.

Established in 2001, CornerStone has over 90 employees and 10,000 customers in New York, Massachusetts and Pennsylvania. Our company headquarters are located in Troy, NY, with regional facilities, customer service and support locations in Syracuse, Oneonta, New York City, Poughkeepsie and Richmond, Mass. CornerStone was ranked, as one of the fastest growing private companies in the United States, on the Inc. 5000 lists in 2007, 2008, and 2010, and is recognized by the Business Review as one of the Capital Region’s Best Places to Work.