| Abbreviation | Definition |
|---|---|
| CT | Computer Telephony |
| CTE | Computer Telephony Engine |
| CTI | Computer Telephone Integration |
| CTIA | Cellular Telecommunications Industry Association |
| CTIE | Centre For Telecommunications And Information Engineering |
| CTIT | College of Telecommunications and Information Technology |
| CTM | Cellular Textphone Modem |
| CTN | Community Telecommunications Network |
| CTN | Corporate Telecommunication Networks |
| CTN | Corporate Telecommunications Network |
| CTNS | Certified Telecommunications Network Specialist |
| CTO | Commonwealth Telecommunications Organisation |
| CTPR | Converged Telecommunications Policy Regulations |
| CTR | Carrier Telegraph Receiver |
| CTR | Covert Telephone Recording |
| CTS | Call Tracking System |
| CTS | Consolidated Telecom Services |
| CTS | Cordless Telephone System |
| CTSO | Cellular Telephone Service Order |
| CTTC | Centre Tecnol??gic de Telecomunicacions de Catalunya |