| Abbreviation | Definition |
|---|---|
| TAU | Test Access Unit |
| TAX | Trunk Automatic Exchange |
| TBB | Telecommunications Bonding Backbone |
| TBD | To Be Decided |
| TBF | Telephone Band Filtering |
| TBI | Telecom Brokerage Inc |
| TbPS | Terabits Per Second |
| TBQ | Telecommunications Billing Question |
| TBR | Tagged Bit Rate |
| TBS | Telephone Billing Service |
| TC | Telephone Call |
| TC | Terminating Channel |
| TCA | Telecom Computing Architecture |
| TCA | Threshold Crossing Alert |
| TCAM | Telecommunications Conformity Assessment and Market |
| TCAP | Transaction Capabilities Application Part |
| TCB | Telecommunication Certification Body |
| TCBH | Time Consistency Busy Hours |
| TCCL | Terminating Carrier Command Line |
| TCCMS | Telecom Consumer Complaints Monitoring System |