Delson Telecommunications Group
- Provides training for system operators, design engineers, and companies seeking to enter the 3G wireless market.
- http://www.delson.org/

Direct Communications, Inc.
- Certified individuals bringing telephony services and network cabling to your business.
- http://www.dci-kc.com/

Dorado Development Group
- Experts in undersea fiber optic communications systems.
- http://www.doradogroup.com/

Dodson-Brown Associates, Ltd.
- Telecommunication Consultants helping Municipal Government. local government and communities establish competitive, broadband, telecommunication networks, state-of-the-art telecommunication services, favorable rates, municipal income.
- http://dodson-associates.com/