| Abbreviation | Definition |
|---|---|
| TELECOMMUTE | Telecommuters |
| TELECOMMUTE | Telecommuting |
| TELEX | TELegraph EXchange |
| TELEX | Teleprinter Exchange |
| TEM | Telecom Expense Management |
| TEM | telecommunications expense management |
| TEM | telecoms expense management |
| TEMIA | Telecom Expense Management Industry Association |
| TENT | Trans European Network Telecom |
| TENZ | Telecommunications Exporters of New Zealand |
| TEO | Telephone Equipment Order |
| TES | Telecom Electric Supply |
| TESMA | Telecommunications Equipment and Services Master Agreement |
| TESP | Telecommunications Enterprise Strategic Program |
| TETRA | Trans-European Trunked RAdio |
| TF | Telepresence Facility |
| TFA | Toll Free Authorization |
| TFL | Telecom Fiji Limited |
| TFO | Tandem Free Operation |
| TFOT | The Future of Telephony |