Value Added Voice Services
Value Added Voice Services
Colour numbers, premium rates services.
- GTS green number: toll-free calls charged to the called party;
- GTS blue number: services with shared costs;
- GTS white number: services for calling a universal number for local or long-distance rates;
- GTS calling cards: services enabling access to calling card systems;
- GTS green number from abroad: UIFN type services (universal international toll-free number) and ITFS (international toll-free line);
- GTS blue number from abroad: service with shared costs from abroad;
- GTS Premium rates services: for simple and efficient service payments over the phone.

