- A-Tel Communications
 - Harwood Heights - Advanced Data Technologies
- Naperville - Specializes in communications wiring solutions, data wiring, and wireless communication solutions.
- 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.
- Innovative Businesses and Services (IBS)
- Glendale Heights - Provides payphones and convenience phones, calling card vending machines, and air/vacuum machines in the Midwest.
- 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
- Professional Teleconcepts, Inc.
- Woodstock - Specializing in telecommunications EF&I of central office equipment and controlled environment communications vaults and huts.
- RemoteLink
- Naperville - Provides easy to use telecommunications services. Solutions available for every size and type of business.
- Sandman, Mike
- Chicago - Specialize in hard to find problem solving tools, test equipment, telephone repair parts and the training needed to use these products.
- Satellite Communication Systems (SCS)
- Wauconda - Provides satellite & production services worldwide, including transportable uplinks, downlinks, single or multi-camera production, and full project coordination.
- TierOne Telecommunications Management Group
- Wheaton - Provides long distance telephone service, conference calling, broadcast fax, high speed Internet, and small business telephone systems.
- Universal Access
- Chicago - Offers network infrastructure products and services, including bandwidth provisioning.
- Women in Cable & Telecommunications
- Chicago
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