About Us

For over 20 years Cornerstone Communications has delivered a higher level of service at a substantial savings.

What We Do

Cornerstone Communications extends the life of a customer’s telephony equipment by maintaining manufacturer deemed “End of Life” systems indefinitely.  This allows customers to upgrade or migrate their systems when it makes business sense not when the manufacturer dictates.

Established in 1997, Cornerstone Communications is a full-service technology company providing solutions for Telecom, Network Infrastructure, and Video Surveillance.

Our mission has always been to provide excellent solution with outstanding customer service to all industries in need of Telecommunications, Network Infrastructure and Video Surveillance. Our team of industry professionals is dedicated to this goal. Each customer is treated as a valuable individual. 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. sales@bizsyscon.com