| Abbreviation | Definition |
|---|---|
| CETC | Competitive Eligible Telecommunications Carrier |
| CF | Call Forward |
| CF | Carrier Furnished |
| CF | Coin First |
| CFA | Carrier Facility Assignment |
| CFA | Carrier Failure Alarm |
| CFNA | Call Forwarding No Answer |
| CFO | Core Funded Organization |
| CFOT | Certified Fiber Optic Technician |
| CFR-47 | Code of Federal Regulations Title 47 (FCC) |
| CFS | Call For Service |
| CFS | Customer Facing Service |
| CFU | Call Forward Unconditionally |
| CGA | Carrier Group Alarm |
| CGI | Cell Global Identity |
| CGMT | Chief General Manager Telecom |
| CGT | Consultants Group for Telecommunications |
| CHE | Central Head-End |
| CHT | Active |
| CHTML | Compact HyperText Markup Language |