| Abbreviation | Definition |
|---|---|
| TSP | Telecom Service Provider |
| TSPS | Traffic Service Position System |
| TSR | Telephone Special Range |
| TSR | Terabit Switch Router |
| TSRP | Telecommunication Sector Reform Project |
| TSRP | Telecommunications Sector Reform Project |
| TSRP | Telecommunications Services Renewal Project |
| TSS | Telecommunication Standards Sector |
| TSSC | Telecom Sector Skill Council |
| TSSI | Telecom Switched Services Interoperability |
| TSSR | Telecommunications System Study Report |
| TSTS | Telecommunications Simulator Test Station |
| TSTT | Telecommunications Services of Trinidad and Tobago |
| TSY | Telephony Server |
| TT | Text Telephone |
| TT | Tiny Telephone |
| TT | Touch Tone |
| TTA | Telecom Technical assistant |
| TTA | Tennessee Telecom Association |
| TTAC | Telecommunication Technology Advisory Committee |