| Abbreviation |
Description |
| TA |
Telecommunications Application |
| TAC |
Telecommunications Arbitration Case |
| TELRIC |
Total Element Long Run Incremental Cost |
| TIA |
Telecommunication Interconnection Agreement |
| TRO |
Triennial Review Order |
| TRS |
Telephone Relay Service |
| TT |
Telephone Tariff |
| UDP |
Utility Discount Program |
| UNE |
Unbundled Network Elements |
| USDOT |
US Department of Transportation |