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About CornerStone

In its ten-year history, CornerStone Telephone Company has grown from a two-person start-up to an established 70-employee advanced communication solutions provider, with over 7,000 customers in three states. We have been recognized, locally and nationally, by Inc. 5000 as one of the fastest-growing private companies in the United States. CornerStone has grown both organically and through acquisition. In 2008, Richmond Telephone Company (RTC), and its CLEC, Richmond Networx — both based in Richmond, Massachusetts — were acquired. In 2011, three additional companies were added: the cloud computing companies Distributed Applications Technologies (DAT) and ActiveHost, both based in New York State's Capital District area, and Public Interest Network Services (PINS), a facilities-based CLEC and data-hosting provider based in Manhattan.

CornerStone expanded its market reach and product portfolio to better serve business customers in New York, Massachusetts, and throughout the US. These expansions were accomplished through strategic acquisitions that provided key assets in the form of both human resources and technologies.

In 2011, CornerStone purchased DAT, a software company started in 2000 as a subsidiary of Ivy Technology, a full service consulting firm. DAT's goal was to deliver the the latest, most powerful software applications, using Software as a Service model, to mid sized businesses. DAT then launched their SkySphere line of hosted services to provide our clients with a seamless transition from the traditional network models to a more cost-effective, up-to-date and rapidly deployed virtual network.

Business customers of all sizes enjoy the benefits of leveraging enterprise-class hosted solutions in every sector, including legal, financial, healthcare, government, education, telecommunications and manufacturing. In 2006, CornerStone had acquired 40% of DAT and by 2010 DAT had moved its operations, including its skilled in-house design and development team and its technical support organization, into CornerStone's headquarters in Troy, NY.

ActiveHost, formed in 1996, established its standing as a premier Microsoft-registered web hosting provider by delivering outstanding service and technical support to customers around the globe. As a Microsoft Certified partner, it offers cutting-edge technology such as ASP, ASP.NET, and MS SQL Server. These resources provide ActiveHost clients with the means to power Web sites that will continue to grow and that will meet future demands.

PINS, a facilities-based CLEC in Manhattan, serves business and enterprise clients with network and data center services. PINS had been operating continuously for over 20 years when CornerStone acquired the company in 2011. The PINS philosophy and mission; its operations and support teams and network technologies; and the range of enterprise and midsized clients it served were all a perfect fit with CornerStone.

PINS provides hundreds of nonprofits with office communications hardware in the form of hosted PBXs, IP PBXs and digital key telephone systems. The PINS facility, at 50 West 17th Street, is connected via three different fiber networks to multiple carriers for voice calls, provides multiple tier-1 Internet backbone operators, and is protected against power failure by full-scale UPS and generator backup.

RTC is a rural independent telephone company acquired by CornerStone in 2008. RTC was formed in 1903 by a group of citizens to provide telephone service to the town of Richmond, Massachusetts. With mostly residential customers served within its 5-square-mile serving area, RTC offers local and long distance service, advanced calling features, and DSL.

Don Walsh and Dan Yamin established CornerStone Telephone Company in 2002. They had first met while working together at FairPoint Communications. After they left the firm, Dan and Don leveraged their knowledge of the CLEC (competitive local exchange carrier) business and made the initial investment with their own capital to launch CornerStone, a business-to-business telecommuncations service provider. Within 18 months, the company was profitable and was offering DSL and hosted e-mail in addition to local and long-distance telephone service.

By 2005, CornerStone had made its first modest acquisitions — Butler Communications, a PBX vendor, and Telecon Communications, a CLEC — and had established sales and service offices throughout New York State. The following year, CornerStone deployed a Class 5 IP softswitch and began their IP core network build, expanding their product offering to include more flexible VoIP (Voice over Internet Protocol) services.

CornerStone's adoption of new technology and their acquisition of a 40% stake in Distributed Applications Technologies (DAT), a cloud computing company offering the SkySphere product line, established them as a full-service communication and networking solutions provider. In 2007, CornerStone's nearly 4000% increase in revenue made it the fastest-growing company in the Capital Region, as recognized by the Business Review, and no. 736 on the Inc. 5000 list as one of the fastest-growing private companies in America. The facilities build-out was completed the following year and included four LATAs (local access and transport area) and 18 central offices.

In 2008, CornerStone was again tapped by the Business Review as one of the areas fastest-growing companies, and was also named one of the Capital Region's Best Places to Work.

In 2009, upon acquiring Richmond Telephone and Richmond Networx in Massachusetts, CornerStone's customer base included more than 10,000 customers with over 50,000 access lines. The Richmond acquisition laid the groundwork for an expansion into the Berkshire region of Western Massachusetts and increased CornerStone's revenue by $6 million per year. CornerStone was again named by the Inc. 5000 as one of the fastest-growing private companies in America. The same year, CornerStone added its full-service security and surveillance services for businesses, assuming responsibility for a base of 800 alarm customers and bringing on state-licensed technicians to support this new line of business.

CornerStone was approved as a New York State vendor, enabling it to service both state and municipal accounts. As CornerStone continued to grow, 2010 brought the hiring of additional staff, and again the distinction of being named one of the Capital Region's Best Places to Work by the Business Review. CornerStone also appeared, for a third time, on the Inc. 5000 list. In 2011, CornerStone closed on two key acquisitions. First, it announced the completion of the purchase of ActiveHost Corporation, a data center and hosting provider located in Schenectady and Albany, and then acquired the remaining 60% of DAT. These increased CornerStone's product and solution portfolio to include co-location, dedicated servers, virtual private servers, hosting services, software as a service, and infrastructure as a service. CornerStone was also named to the INC. 5000 list for the fourth year in a row.

Next, the company bought out Public Interest Network Services, Inc. (PINS) and Public Interest Telecommunications, Inc., extending its facilities-based footprint into New York City, Westchester and Long Island. This round of takeovers is expected to increase CornerStone's annual revenue to over $45 million. The company plans to continue its growth strategy, to consistently offer the most cutting-edge technology, and to increase service offerings as it moves toward its next decade in business.

At CornerStone Telephone Company we have a commitment to delivering communication and networking solutions with the highest level of customer support and technical assistance. Our growth strategy has included adding new service markets. We do this by ensuring that we have the facilities, network and the people to support each service area. Our network build-out was completed in 2008, and includes four LATAs (Local Access and Transport Areas). Our services cover the Capital Region, western New York, upstate New York, New York's southern tier, the New York metro area and Hudson Valley, and Western, Massachusetts. We service over 10,000 customers in New York, Massachusetts and Pennsylvania, with over 50,000 access lines offering telephone, Internet, hosting, data center, cloud computing, security services and strategic sourcing. Please contact us at your regional office to find out more about the services available in your area.

Regional Offices

Troy, New York

Serving the Capital District, Saratoga and the Adirondacks

Oneonta, NY

Serving Central Leatherstocking Region
34 Main Street, 1st Floor
Oneonta, NY 13820

Syracuse, NY

Serving Finger Lakes and Central New York
4713 Crossroads Park Drive
Liverpool, NY 13088

Poughkeepsie, NY

Serving the Catskills and Hudson Valley
41 Page Park Drive, Suite 102
Poughkeepsie, NY 12603

New York, NY

Serving New York Metro area
50 West 17th Street, 9th Floor
New York, NY 10011

Richmond, MA

Serving Western Massachusetts
1416 State Road
Richmond, MA 01254

CornerStone Telephone Company
2 Third Street
Suite 303

Troy, NY   12180

Phone: +1-518-272-1018
Fax: +1-518-273-2750
Toll-free: +1-866-240-1912


Contact Us

Successful organizations are built on people.

From the very start, CornerStone’s founders and board of directors recognized that to build a profitable company, it must be led by the right team of people. Over the course of its seven year history, CornerStone has expanded its core senior management team with key personnel from both inside and outside the telecom industry.

The result of this effort is a well-balanced team that thrives on dynamic collaboration and feedback between members.


Our Vision

CornerStone Telephone Company will strive to deliver comprehensive communication solutions and innovative technologies aligned with our customer's organizational objectives. As a respected partner, we are driven to enhance the customer experience through quality products and accessible, knowledgeable resources.

A mission to serve

CornerStone's mission is to serve our clients by providing reliable business communication 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.



Inc. 5000 – Inc. 5000 each year honors America’s fastest growing private companies, based on revenue growth over the previous three years.  CornerStone has been honored to be on the Inc. 5000 list since 2008.
The Business Review Fastest Growing Companies and Best Place to Work – The Capital District Business Review, a business weekly published in the Capital Region, has honored CornerStone as one of the fastest growing local companies since 2007.  We were also honored as a Best Place to work in 2011.
Downtown Troy Business Improvement District – The Downtown Troy BID honored CornerStone with their first Established Business of the Year award in 2012, for commitment to assisting the BID further it’s mission, and dedication to growing the business in downtown Troy.
Parallels Partner of the Year – Parallels bestowed CornerStone with their 2012 North American Regional Partner of the Year based on the demonstrated ability to provide easy-to-use cloud services and who also has a growing base of satisfied SMB customers.
SSAE 16 Type II Certified – this certification evaluates an organizations’ information systems relevant to security, availability, processing integrity, confidentiality or privacy.  This is an enhancement on SAS 70 Type II certification, which CornerStone previously held.
Microsoft Gold Certified Partner – CornerStone is able to provide Microsoft services for a range of Microsoft products.
Cisco CCNA – CornerStone employs Cisco CCNA certified engineers.