Abstract: The present invention includes method and systems, and communication terminal, for transmitting a variety of information and contents (Ring-Back Information) such as music, songs, advertisements, sounds, voices, any audible resource edited by the subscriber, animation, and moving images, instead of the uniform ring-back tone (an mechanical tone) which has been provided to a calling party while the calling party is waiting for the called party's answer after the calling party executes a call setup request. According to the invention, the Ring-Back Information selected by the called party is provided to the calling party by inter-working of the terminating exchange 10-n and the terminating terminal 20-n.

Abstract: The present invention relates to a method and system to prevent the service registration information such as ID, password to make sure of user's identity from illegally being used by a third party in an effective way when various kinds of service are used in both on-line and off-line. The method and the system according to the present invention have procedures of notice, approval or refusal to approval, approval & report, refusal & report, approval after identification at the time of payment, deposit withdrawal, connection to security systems and charged Internet websites, entrance into security places and issuance of important private documents/archives, and so on.

Abstract: A method, for use in a mobile communications system (MCS), efficiently generates routing information when a caller of a first electronic switching system (ESS) calls a receiver's phone connected to a second ESS through a base station system, wherein the routing information is used for the first ESS to choose one of a plurality of transit networks (TN's) formed between the ESS's to communicate voice messages and/or data between the caller and the receiver. At a first step, if there is a first demand signal from the first ESS, roaming information representing the location of the receiver is derived, wherein the first demand signal is generated when an identification code, indicating that the receiver is a mobile subscriber, is received by the first ESS from the caller.