Our Customers

For over a decade Cornerstone Communications has provided Avaya and Nortel users the most comprehensive telecom maintenance solutions in the industry. From small businesses to Fortune 500 Companies, encompassing a diversity of business types worldwide, Cornerstone's custom maintenance programs are designed to fit the specific needs of our clients. Below is a partial list of businesses we currently service.

  • Alere North America
  • American Recreation
  • AMTrust, North America
  • Archdiocese of Cleveland
  • Campbell-Ewald Company
  • Catholic Charities
  • Cerro Flow Products
  • Charles Industries
  • E.I. duPont, Canada
  • Elantas P.D. George
  • Enersys
  • FAA - Federal Aviation Administration
  • Fair Oil Company
  • Fort Riley Kansas
  • Fulton State Hospital
  • FUNDtech
  • Georgia Pacific
  • GrafTech International Holdings, Inc.
  • Holy Name High School
  • Ingram Entertainment
  • INVISTA - USA & Canada
  • Jet Aviation
  • Koch Heat Transfer Canada
  • Lake Regional Hospital
  • Lufthansa/LSG Sky Chefs
  • Magellan Health Services
  • Mannatech 
  • McMahon Berger
  • Media General NBC 13 WVTM
  • Mercy Ships
  • Mineral Area College
  • Newport Franklin
  • Northeast Regional Medical Center
  • North Ottawa Community Hospital
  • Nova Machine Products
  • NTSB - National Transportation Safety Board
  • Orscheln Farm & Home
  • PDX, Inc.
  • RockTenn
  • Sabreliner Corporation
  • Sands Resorts
  • Sanofi-Aventis
  • Schulze & Burch Biscuit Company
  • Southeast Missouri State University
  • Special School District of St. Louis
  • St. Patrick's Episcopal Church & Day School
  • St. Pius/St. Leo School
  • Standard Machine
  • Terex Cedarapids
  • Thermo Fisher Scientific
  • URS Corporation
  • US Mint
  • USGS, Iowa Water Science Center
  • Western Area Power



If you would like to join our Family of satisfied customers please contact a Cornerstone representative today at info@cornerstonecomm.com.