| 摘要 |
PURPOSE: An advertising method by using a ring-back tone is provided to send an advertising message instead of the ring-back tone until a receiver's telephone receives a call. CONSTITUTION: A sender-side switching system receives a dial signal generated from a sender's telephone set and sends a dial tone to the sender's telephone set. The sender which hears the dial tone sends a receiver's telephone number to the sender-side switching system. Then the sender-side switching system transmits the receiver's telephone number to a receiver-side switching system at a calling stage. The receiver-side switching system checks the state of the receiver's telephone, e.g., ready or busy, and, subsequently, send, e.g., a ring-back tone in conformity to the state to the sender-side switching system. The sender-side switching system receives the ring-back tone. In case the ring-back tone is a busy tone, the sender-side switching system forwards the busy tone to the sender's telephone set. Otherwise, that is, the ring-back tone is a ringing tone which implies that the receiver's telephone is ready to receive a call, the sender-side switching system searches registered member information by consulting a database linked to the controller and checks if the receiver's telephone number matches a registered member in the database. If the sender is determined not to be a registered member, the sender-side switching system forwards the ring-back tone. Otherwise, the sender-side switching system sends a predetermined advertisement message stored in an advertisement memory to the sender's telephone set. If a response, e.g., a hook-off, from the receiver's telephone is perceived or if the sender terminates the call, the sender-side switching system stops the sending of the advertisement message.
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