Sk Telecom Company, Ltd.

Myungsung Lee

Seongsoo Park

Sehyun Oh

Wonsuk Chung

Donghahk Lee

SeongKeun Kim

Daesic Woo

Sangshin Lee

Sung Jin Kim

Jonghoon Park

Namgyu Kim

Joosik Lee

Sangyun Lee

Hojin Yang

Jongtae Ihm

Seongho Ha

Jungpyo Han

Heehyeok Hahm

Seunghwan Kwak

Donghahk 809-1101 Imaechon Jinheung Apt Lee

Disclosed herein is a fast data call connection method capable of reducing a connection time and increasing the probability of connection success in a CDMA 2000 network. In the fast data call connection method of the present invention, the PDSN transmits a data call connection request message, including an authentication type and a challenge value, to the MS. The MS transmits a data call connection response message, including a response to the challenge value, to the PDSN. The PDSN performs authentication with reference to the data call connection response message, and transmits a data call connection complete message to the MS if authentication succeeds. Accordingly, the present invention is advantageous in that it can reduce connection time, can increase the probability of connection success, and can guarantee compatibility by checking the MS version before a data call connection process is executed.

Fast data-link connection method for saving connection time in CDMA 2000 network

Disclosed is a method for providing a multimedia Ring Back Tone (RBT) service by using a receiver-side switching center, which comprising the steps of: (a) receiving an ISDN User Part (ISUP) call connection request message including information (multimedia codec information) regarding a multimedia codec from a caller-side switching center when the originating terminal attempts a call connection to a terminating terminal; (b) transmitting the ISUP call connection request message including the multimedia codec information to a sound source-providing server; (c) requesting the caller-side switching center to set the multimedia codec, thereby activating a routing path for the RBT service; and (d) receiving a RBT sound source selected using the multimedia codec information from the sound source-providing server and transmitting the RBT sound source to the caller-side switching center.

Method and system for providing multimedia ring back tone service by using receiver-side switching center

Disclosed is a method and a system for setup of a multimedia codec and a voice codec between a mobile phone system and a terminal, in providing a multimedia RBT service capable of operating a multimedia codec allowing high quality music playback during an RBT interval and operating a voice codec such as an Enhanced Variable Rate Codec (Hereinafter, referred to as EVRC) during voice communication when an originating terminal supports the multimedia codec capable of improving the music quality in addition to a dedicated voice codec such as the EVRC.

Method and system for terminal codec setup of multimedia ring back tone service

Disclosed is a method for controlling a terminal for a multimedia Ring Back Tone (RBT) service, which allows RBT sound sources previously set in a sound source-providing server by a called subscriber to be reproduced to an originating terminal by means of a Home Location Register (HLR) and the sound source-providing server for storing the RBT sound sources when a calling subscriber telephones the called subscriber, the HLR storing profile information including whether the subscriber has joined the RBT service. The method includes the steps of: (a) receiving a codec setup message including information (multimedia codec information) regarding a multimedia codec from a switching center; (b) deactivating a decoding function of a voice codec; (c) activating a decoding function of the multimedia codec; (d) receiving the RBT sound sources; and (e) decoding the RBT sound sources through the multimedia codec and reproducing the decoded RBT sound sources.

Terminal for multimedia ring back tone service and method for controlling terminal

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Seoul, South Korea

Myungsung Lee