Patent ID: 7242756

Claim:
A method of providing an arbitrary sound as an RBT (RingBack Tone) in a communication network where flexible paging is conducted for a called terminal, comprising: a first step, conducted respectively by both exchangers, of checking whether first information on replacing RBT or not and second information informing a route to a sound providing means has been stored for the called terminal, when an originating exchanger requests a trunk connection to said both exchangers according to a flexible paging procedure, and receiving the first and the second information from an HLR (Home Location Register) after requesting if said information has not been stored, and requesting a trunk connection to the sound providing means while furnishing information identifying the called, based on the already-stored or the received first and the second information; a second step, conducted by the sound providing means, of determining an RBT-replacing sound based on the called-identifying information, and transmitting the determined RBT-replacing sound to the originating exchanger through two paths made respectively by way of said both exchangers; and a third step, conducted by the originating exchanger, of selecting one path of the two, and delivering the determined RBT replacing sound received through the selected path to a caller.