| Abbreviation | Definition |
|---|---|
| STP | Shielded Twisted Pair |
| STP | Signal Transfer Point |
| STPI | Stentor Telecom Policy Inc |
| STR | Sukkur Telecom Region |
| STR | Synchronous Transmitter/Reciever |
| STRS | Space Telecommunication Radio System |
| STRS | Space Telecommunications Radio System |
| STS | Small Telephone System |
| STS | Synchronous Transfer Signal |
| STSB | Secure Telephony System Bus |
| STUN | Simple Traversal of UDP (User Datagram Protocol) through NAT (Network Address Translation) |
| STV | Special Tariff Vouchers |
| STVM | Straight To VoiceMail |
| SU | Service Unlimited |
| SUF | Service Update Facility |
| SUT | Sametime Unified Telephony |
| SVC | Scalable Video Coding |
| SVC | Single Voice Coil |
| SVC | Switched Virtual Circuit |
| SVD | Simultaneous Voice and Data |