Caller Ring Back Tone (CRBT) is an innovate service which gives the subscribers the flexibility to greet callers with their favorite tune, sound, or phrase instead of the usual ringing tone. They can decide what a caller will hear during interconnection of the call and the subscribers have an instant way in expressing their own individuality. The Ring Back Tone solution adds a tune that the subscriber chooses using a simple, multi-criteria customization process. For operators, this innovative new service offers solid revenue-enhancing opportunities in both the consumer and corporate market segments.