Patent ID: 7072644

Claim:
A method of providing an arbitrary sound as an RBT (RingBack Tone) in a telephone communication network, comprising: a first step, conducted by an exchanger when a call is received from a terminal, of checking subscriber information to know whether the calling terminal and a called terminal have subscribed to RBT replacement service, and, if it is confirmed from the checking that the calling terminal has subscribed to RBT replacement service and the called terminal is a subscriber of other telephone communication network, requesting a first trunk connection to said other telephone communication network while requesting a second trunk connection to a sound providing means with reference to preset routing information to the sound providing means; a second step, conducted by the sound providing means, of selecting an RBT-replacing sound set for the calling terminal based on information contained in the request of the second trunk connection, and providing the selected RBT-replacing sound for the calling terminal through the exchanger the second trunk connection is made to; and a third step, conducted by the exchanger, of releasing the second trunk connection by requesting the sound providing means to release the second trunk connection when call acceptance of the called terminal is informed via the first trunk connection.