- Covad Communications
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- Covad Communications
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- Covad Communications
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- Cox Business Svc
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- Cox Communications
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- Cox Communications
- Cox Ct Telcom LLC
- Cox Ct Telcom LLC
- Coye's Communications
- Coye's Communications
- CPR Telecommunications
- CRC Networks Inc
- Creative Interconnect Inc
- Credence Systems Corp
- Cremer Engineering Co Inc
- Crestlin LLC
- Cricket Fiber Svc
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- Crimson Tech
- Critical Communications
- Critical Path Inc
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- Cross Bow Communications
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- Crosscom National
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- Crossconnect Central
- Crossconnect Services Inc
- Crosslake Communications
- Crown Atlantic Co
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- Crown Atlantic Co
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- Crown Atlantic Co
- Crown Atlantic Co
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- Crown Point Telephone Corp
- CRT Communications
- Crystal Clear Communications
- Crystal Clear Communications
- Crystal Communication Inc
- Csd Relay
- Csd Relay
- CSG Telecom
- CSI-Telecom Inc
- CTAP
- CTC Communications Corp
- CTC Communications Corp
- CTC Communications Corp
- CTC Communications Corp
- CTC Communications Corp
- CTC Communications Corp
- CTC Communications Corp
- CTC Communications Corp
- CTC Communications Corp
- CTC Internet
- CTC Of Ohio
- CTI
- CTI
- CTI
- CTI Communication
- CTS
- Cts Net An Allegiance Telecom
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- CTS Telecomm
- Cumberland Technologies Inc
- Cunningham Telephone & Cable
- Curtain Call Communications Co
- Curtis Group
- Custom Call Ctr Inc
- Custom On Hold Messages
- Custom Response Teleservices
- Custom Telecard Inc
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- Custom Telephone Svc
- Custom Telephone Systems
- Customer Advised Retention Svc
- Customer Direct
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- Cutting Edge Communications
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- Cybernet Communications
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- Cyberspace Engineering Group
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- Cypress Communications Holding
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- D & K Enterprises
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- D & S Communications Inc
- D & S Communications Inc
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- D & S Telecom Inc
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- D & T Vending
- D B Com Inc
- D C Communications
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- D C Telecom Inc
- D F King & Co
- D Friar Inc
- D G Tec LLC
- D L Marshall & Assoc Inc
- D L Phillips & Assoc
- D Sc Telecom
- D V Technologies Inc
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- D V Telecommunications Inc
- Dain Communications
- Dakota Carrier Network
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- Dalton Telephone Co
- Dalton Telephone Co
- Dande Communications
- Daniels Communications
- Dantech
- Darome Teleconferencing Inc
- Data & Voice Integration
- Data Connection Corp
- Data Fix Phone & Data Instltn
- Data Link Inc
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- Data Tel
- Data Tel
- Data Tel Communications Inc
- Data Trac Information Svc
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- Data-Tech Communications Inc
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- Database Telecommunications
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- Datamonitor
- Datavoice Technology
- Datavon Inc
- Datek Communication
- Datel Services Inc
- Dav Con Inc
- Dave's Communication Systems
- Dave's Communication Systems
- Dave-Tel Communications
- Davel Tel Inc
