About Us


Cornerstone Communications began in 1997 as a telecom maintenance company, providing technical support to other maintenance companies in the industry. As we incorporated services appreciated by our customers, we evolved into a superior maintenance company offering a highly personalized approach to businesses of all sizes. Over a decade later, we have grown into a successful, well-respected telecom maintenance service provider for Avaya and Nortel product users. Our telecom maintenance solutions include our Premium Protection, Partnership,Legacy and GSA Maintenance Programs as well as 24/7 Secure Watch Monitoring and Web Portal Ticketing Services.

Our mission has always been to provide excellent telecom maintenance and monitoring programs with outstanding customer service. Our team of industry professionals is dedicated to this goal. Each customer is treated as a valuable individual. We are a telecom maintenance provider that listens to your specific needs and responds accordingly. Our highest priority is making sure the job is done accurately from the very beginning. Having grown exponentially since 1997, Cornerstone Communications still conducts business like a small, customer-oriented company. We take pride in our excellent telecom maintenance services and our highly-satisfied customers.



Cornerstone Communications is proud to partner with in-house sister companies Systems Plus Telecom, Business Systems Connection.

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.

Business Systems Connection, INC, Established in 1997, BSC is a premier reseller of New and Refurbished Data Networking, Voice and Video Communication products. Our specialty is Wireless Networking Systems and Components. We stock thousands of items in our 20,000 square foot warehouse facility. Centrally located just south of St. Louis, Missouri,

  • 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