| Abbreviation | Definition |
|---|---|
| OAA | Over-the-Air Activation |
| OAM&P | Operations, Administration, Maintenance, and Provisioning |
| OAMP | Operations, Administration, Maintenance, and Provisioning |
| OATN | Open Access Telecom Network |
| OBSAI | Open Base Station Architecture Initiative |
| OBT | Ohio Bell Telephone |
| OC | Operator Cutoff |
| OCA | Outstate Calling Area |
| OCC | Online Credit Charging |
| OCC | Optical Communication Channel |
| OCC | Other Common Carrier |
| OCD | Out of Cell Delineation |
| OCN | Operating Company Number |
| OC-n | Optical Carrier level n |
| OCS | Office Communication System |
| OCS | On-line Charging System |
| OCTA | Ohio Cable Telecommunications Association |
| OCU | Office Channel Unit |
| OCWN | Orange County Wireless Network |
| OD | Operator Dialed |