In Ontario, the feature is commonly referred to as Ident-a-Call (Bell Canada), in western Canada Smart Ring (Telus and Northwestel), as well as Teen Ring. In the United States, AT&T refers to the feature as RingMaster, in Australia Telstra refers to the feature as Duet and in the UK, it's known as Call Sign by British Telecom.
The feature is referred to by various names depending on the country or region: Ident-a-Call (Ontario), Smart Ring (western Canada), Teen Ring (various). In the United States, AT&T refers to it as RingMaster, in Australia as Duet, and in the UK as Call Sign.