| Abbreviation | Definition |
|---|---|
| POH | Phone Off Hook |
| POIP | Presence Over Internet Protocol |
| POMI | Programmable Open Mobile Internet |
| PON | Passive Optical Network |
| POS | Packet Over SONET (Synchronous Optical NETwork) |
| POS | Point Of Service |
| POT | Plain Old Telephone |
| POT | Point Of Termination |
| POTS | Plain Old Telephone Service |
| POTV | Plain Old TeleVision |
| POTWA | Post and Telecommunication Workers Union |
| POU | Point Of Use |
| PPM | Pulse Position Modulation |
| PPSD | Personal Portable Security Device |
| PPSN | Public Packet Switched Network |
| PPT | Post Production Test |
| PPTN | Professional Provider Telecommunication Network |
| PPTN | Professional Provider Telecommunications Network |
| PR | Please Retry |
| PRA | Primary Rate Access |