Patent ID: RE44169

Claim:
A method for supporting session mobility from a first device having respective sessions connected with at least one service device to a second device, comprising: a) determining whether an address of the second device is defined by the first device when the session movement begins from the first device; b) at a), transferring session information including data for supporting session mobility from the first device to the second device when the address of the second device is defined clearly by the first device, and transferring the session information data from the first device to the session management server when the address of the second device is not defined clearly; at b), when the session data is transferred to the session management server, c) storing the session data and the user identification of the a received SIP PUBLISH message at the session management server; d) transferring a SIP SUBSCRIBE message including the user identification from the second device to the session management server; e) transferring the session data having the same user identification as the user identification included in the SIP SUBSCRIBE message from the session management server to the second device through a SIP NOTIFY message; f) generating a SIP session establishment message from the second device and transferring the SIP session establishment message to the predetermined service device by utilizing the received SIP NOTIFY message; and g) establishing new sessions between the service device and the second device by utilizing the received SIP session establishment message.