| Abbreviation | Definition |
|---|---|
| OOSP | Out Of Service Permanently |
| OPN | Outage Performance Monitoring |
| OPP | Object Push Profile |
| OPS | Optical Packet Switching |
| OPS/INE | OPerations System/Intelligent Network Element |
| OPT | Ozarks Public Telecommunications |
| OPTUS | Outages, Poor Telecommunications, Useless Systems.... OPTUS 'yes' |
| OPX | Off Premise Extension |
| OR | Office Regenerator |
| ORB | Office Repeater Bay |
| ORJ | Operating Request Job |
| OS | Operations System |
| OSM | Optical Services Module |
| OSP | Online Service Provider |
| OSP | OutSide Plant |
| OSS | Omnitrax Switching Services |
| OSS | Operation Support System |
| OSS | Operation Support Systems |
| OSS | Operator Services System |
| OSTA | Open Standard Telecom Architecture |