Affiliates


Cornerstone Communicaions is proud to partner with in-house sister companies Systems Plus Telecom, TQM Labs, and DISVETS Telecom & Data Solutions. All four companies support Avaya and Nortel product lines.


Systems Plus Telecom is a full service company, founded in 1994, which specializes in the purchasing, refurbishing and remarketing of Avaya Telecommunications equipment. As a purchaser, you can always find a cheaper price, but experience will tell you, a cheaper price may equal lesser quality. Systems Plus Telecom provides top quality refurbished products at a competitive price. The telecommunications equipment we market is refurbished and tested in-house for optimal quality. In addition, all products purchased from Systems Plus Telecom typically come with a one-year warranty.

Contact a Systems Plus Telecom service representative today at 800-349-3103 or email us at sales@sptphones.com.


TQM Labs began in 1991 as a full service telecom repair center for Avaya, Nortel, Toshiba, Mitel/Intertel and other telecom industry manufacturers. While some companies are satisfied with a quick test and wipe down, TQM Labs maintains a higher standard. We raised the bar in the telecom repair field by building a rock solid reputation with our team of trained technicians who diagnose your problem, perform the repair and execute the refurbishment in-house. TQM’s customers have come to expect like-new, fully functioning equipment when they take advantage of our top-notch telecom repair/refurbish service.

Please contact a service representative at 866-876-2500 or email us at sales@tqmlabs.com.


DISVETS Telecom & Data Solutions, LLC, services the specific needs of Government Agencies. We are an alternative resource for maintenance, products, and support of all Avaya and Nortel telecommunications equipment. DISVETS Telecom & Data Solutions, LLC has the ability and the technology to manage your account with an unsurpassed level of client service. Your complete satisfaction and smooth system operation is our first priority. DISVETS Business Types and Grants include the following:

  • 2X - For-Profit Organization
  • 77 - Service Provider
  • A5 - Veteran Owned Business
  • LJ - Limited Liability Company
  • QF - Service Disabled Veteran Owned Business
  • VW - Contract and Grants

North American Industry Classification System (NAICS)

  • 238210 - Electrical Contractors and Other Wiring Installation Contractors
  • 334210 - Telephone Apparatus Manufacturing
  • 423690 - Other Electronic Parts and Equipment Merchant Wholesalers
  • 517911 - Telecommunications Resellers
  • 532490 - Other Commercial Industrial Machinery and Equipment Rental Leasing
  • 624190 - Other Individual and Family Services
  • 811213 - Communication Equipment Repair and Maintenance