- A-Tel Communications
 - Harwood Heights - BTI Communications Group, Ltd
- Chicago - Offering phone systems, cellulars, and service needs for businesses.
- Communitech Services
- Elk Grove Village - Offers Baypoint and Centigram voicemail systems.
- CommWorks
- Rolling Meadows - Provider of IP-based networking services.
- Digital Voice Systems (DVS)
- Northbrook
- Enclosures Inc.
- Franklin Park - Payphones, calling cards and accessories.
- Focal Communications Corporation
- Chicago - Provides local phone and data services to communications-intensive customers.
- I-NET Communications, Inc.
- Schaumburg - Provides installation services for communication equipment.
- King Communications, Inc.
- Hoffman Estates - Distributor for local and long distance networks.
- Low Voltage Solutions Inc.
- Arlington Heights - Design and installation of voice, data, sound and security systems.
- Midwestern Telecommunications Inc.
- Chicago
- Sandman, Mike
- Chicago - Specialise in hard to find problem solving tools, test equipment, telephone repair parts and the training needed to use these products.
- Universal Access
- Chicago - Offers network infrastructure products and services, including bandwidth provisioning.
- Women in Cable & Telecommunications
- Chicago
|
