Patent ID: 8724528

Claim:
A method for informing a first access gateway, attaching a mobile node to a first network, about the identity of a second access gateway, attaching a correspondent node to a second network, comprising the steps of: informing the correspondent node about the identity of the second access gateway, by using messages for a session initiation between the mobile node and the correspondent node, the informing of the correspondent node about the identity of the second access gateway by using messages for the session initiation not being provided directly by the mobile node to the correspondent node, informing the mobile node about the identity of the second access gateway using messages of a first route optimization procedure initiated by the correspondent node with the mobile node, the informing of the mobile node about the identity of the second access gateway using messages of the first route optimization procedure not being provided directly by the correspondent node to the mobile node, and extracting by the first access gateway the identity of the second access gateway from a message, comprising the identity of the second access gateway, transmitted from the mobile node to the correspondent node.