| Abbreviation | Definition |
|---|---|
| CLID | Calling Line IDentifier |
| CLIP | Caller Line Identification Presentation |
| CLLM | Consolidated Link Layer Management |
| CLNP | ConnectionLess-mode Network Protocol |
| CLOS | Clear Line Of Sight |
| CLP | Cell Loss Priority |
| CLS | Current Level of Service |
| CM | Connection Manager |
| CMAS | Cellular Messaging Alert System |
| CMISE | Common Management Information Service Element |
| CMM | Cable Management Module |
| CMM | Calls, Minimums, Maximums |
| CMO | Casual Multiplayer Online |
| CMOS | Cellular Management Operation System |
| CMP | Connection Management Procedure |
| CMRS | Commercial Mobile Radio Services |
| CMS | Call Management System |
| CMT | Commercial Metering Transponder |
| CMTE | CyanogenMod Theme Engine |
| CMTS | Cellular Mobile Telecom Service |