The present invention relates to a mobile communication terminal for a method for providing a multimedia RBT service and a mobile communication system and Multimedia Ring Back Tone service. ; The present invention is a home location register (HLR: Home Location Register) which stores a profile information including whether the subscriber's Ring Back Tone service subscription using the sound source-providing server that stores, RBT sound source, the calling subscriber to the called subscriber If a call in the method for providing a multimedia RBT service to ensure that the called subscriber is RBT sound source is played to the calling-side mobile communication terminal pre-set in the sound source-providing server, (a) the calling mobile communication terminal is the called mobile communication comprising: attempting to call connection to a terminal, receiving a plurality of multimedia codec information to the location information of the called mobile communication terminals, supported by the ring back tone service subscription and whether the calling mobile communication terminal of the called mobile communication terminal from the home location register .; (B) step of the called mobile communication terminal has joined the RBT service if it is, transmitting the ISUP (ISDN User Part) call connection request message including the multimedia codec information to a plurality of the sound source-providing server; (C) the step of requesting the setup of the multimedia codec to the originating base station controller activating a routing path for the RBT service; And (d) provides a method for providing the multimedia RBT service characterized in that for receiving the selected RBT sound sources by using a plurality of multimedia codec information from the sound source-providing server, comprising transmitting to the calling-side mobile communication terminal . ; According to the present invention, high by providing a way that while utilizing various types of multimedia codecs in the RBT service RBT interval and operating a multimedia codec for high quality music when a voice call can be operating a voice codec such as the EVRC It has the effect of providing a quality RBT service. ; Ring back tone, the mobile switching center, the multimedia codec, a vocoder, the terminal
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