Patent ID: 7974269

Claim:
A method for controlling mobile communication in a communication network that includes a home agent server for managing location information of a mobile node, and a SIP (Session Initiation Protocol) server, said method comprising the steps of: sending a first registration request message which requests a registration of a Care-of-Address acquired in a visited network from said mobile node to said home agent server; matching said Care-of-Address of said mobile node indicated by said first registration request message with a home address of said mobile node; storing the matched Care-of-Address by said home agent server; sending a second registration request message which requests a registration of said Care-of-Address from said mobile node to said SIP server; storing a matching relation of a resource identifier (URI) of said mobile node indicated by said second registration request message and said Care-of-Address in an SIP information management table by said SIP server; and executing a communication procedure for session establishment between said mobile node and a correspondent node through said SIP server, wherein, in said communication procedure for session establishment, when an SIP session establishment request (INVITE) message which specifies a destination node using said resource identifier is sent from said correspondent node to said SIP server, said SIP server refers said SIP information management table, specifies said Care-of-Address of said mobile node which corresponds to said resource identifier of said destination node, and transfers said SIP session establishment request message to said Care-of-Address.