Patent ID: 7831835

Claim:
A method, comprising: causing, at least in part, actions that result in reception by a first serving node of a foreign network that a mobile terminal is roaming in, of at least authentication information for the mobile terminal from a serving node of a home network of the mobile terminal; assigning by the first serving node an identification to the mobile terminal based on the received authentication information; generating by the first serving node an encryption key for the mobile terminal using at least the authentication information of the mobile terminal; causing, at least in part, actions that result in transmission of the encryption key from the first serving node to the mobile terminal via a first network access server connected to the first serving node of a first domain in the foreign network; and when the mobile terminal is handed over from the first network access server to a second network access server connected to a second serving node of a second domain in the foreign network, causing, at least in part, actions that result in transmission of the authentication information and the encryption key of the mobile terminal from the first serving node to the second serving node in response to a request from the second serving node.