| 摘要 |
A system and a method for providing an instant message service based on an IMS(IP(Internet Protocol) Multimedia core network Subsystem) are provided to use an IM server or an MSRP server, thereby preventing session connection failure due to lack of resources in originating or incoming terminals. An IM(Instant Messaging) server(230) manages an IM chatting session for transmitting an IM chatting message and a file between user terminals(100,300) being connected to a mobile Internet. An MSRP(Message Session Relay Protocol) server(240) assigns an MSRP session resource for the IM chatting message or file transmission and transfers the IM chatting message. The MSRP server assigns MSRP resources for an incoming user terminal and an originating user terminal. The IM server sets up the IM chatting session based on an MSRP resource assignment result.
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