Contact Us


CornerStone has offices across New York State and into western Massachusetts.  

If you need to get in touch with our customer service and support team, please call us at the number below, or visit our support page.  If you'd like to reach someone on our sales team, please click here.

CornerStone Telephone Company
2 Third Street
Suite 303
Troy, New York 12180
Phone: 518-272-1018
Fax: 518-273-2750

Toll-free: 1-866-240-1912

Troy, New York

Serving the Capital District, Saratoga and the Adirondacks

Oneonta, NY

Serving Central Leatherstocking Region

Liverpool, NY

Serving Finger Lakes and Central New York

Poughkeepsie New York

Serving the Catskills and Hudson Valley

Manhattan, New York

Serving New York Metro area

Pittsfield, Massachusetts

Serving Western Massachusetts