Patent ID: 7509149

Claim:
A method of providing a sound source change service, which changes a sound source of at least one supplementary service of a calling party using a sound source of a ring back tone replacing sound of a called party during placing of a call, in a service providing system connected to a Mobile Switching Center (MSC) managing at least one calling terminal and at least one called terminal through a mobile communication network, a service IP server and a Contents Provider (CP) server, comprising: detecting a DTMF shortcut key signal received from the calling terminal through the service IP server during the placing of a call using the calling terminal; receiving collected information from the service IP server in response to the DTMF shortcut key signal; processing the collected information in a predetermined form; transmitting a ring back tone replacing sound code included in the collected information to the CP server on the basis of the processed information, the CP server extracting a sound source code of the supplementary service corresponding to the ring back tone replacing sound code using a mapping table formed to allow a plurality of sound source codes, provided from at least a first Master Contents Provider (MCP) and a second MCP that provides the supplementary service to the calling party, and names of singers and titles of songs corresponding to the plurality of sound source codes to refer to each other; receiving the sound source code from the CP server; and transmitting a sound source change request signal including calling party information, included in the collected information, and the sound source code to the second MCP.