- C Three Group, The
 - Atlanta - Offers corporate-level consulting including market research, reports, and training to the utility and telecommunications industries. - Engineering Associates, Inc.
- Atlanta - Full-service firm specialising in voice, data, video, and wireless communications, network design, and implementation.
- Galaxy Engineering
- Alpharetta - Provider of turnkey engineering and consulting services, including the design, implementation, and optimisation of broadband, PCS, and 3G wireless networks.
- MacBeth Williams
- Atlanta - Helps organisations worldwide assess, design, procure, and implement voice, data, and video technology as well as offering call centre consulting.
- Select AdvantEdge, Inc.@
- Riverdale
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