| Abbreviation | Definition |
|---|---|
| GSST | General Subscriber Services Tariff |
| GSTN | General Switched Telephone Network |
| GT&T | Guyana Telephone and Telegraph Company |
| GTA | Georgia Telecommunications Association |
| GTB | Global Telecom Brokers |
| GTB | Global Telecoms Business |
| GTC | Global Telco Consult |
| GTCU | Georgia Telco Credit Union |
| GTI | Graphics, Text, and Images |
| GTIS | Government Telecommunications And Informatics Services |
| GTM | Go To Meeting |
| GTP | GPRS (General Packet Radio Service) Tunneling Protocol |
| GTS | Global Telecom Solutions |
| GTSS | Global Telecom Solutions Sector |
| GTTI | Global Telecommunication Training Institute |
| GTXC | Global Telephone Exchange Carrier |
| GVT | Global Village Telecom |
| GWCS | General Wireless Communications Service (46560 - 4685 MHz) |
| GWTS | Global Wholesale Telecom Services |
| HBH | Hop-By-Hop |