- ADC Telecommunications
- ADC Telecommunications
- Adesta LLC
- Adesta LLC
- Communication Consultants
- Communication Consultants
- Douglas Telecommunications
- Eschelon Telecom Inc
- Greenwood Telecommunications
- MFS Telecom Of Denver Inc
- National Exchange Carriers
- Onfiber Communication
- SBC Datacomm
- SBC Telecom Inc
- Telwares Communications
- Time Warner Telecom Inc
- Unisphere Solutions
- Vercuity Solutions Inc
