Patent ID: 8676159

Claim:
A method comprising: intercepting, by a firewall device positioned between a first support node of a first mobile network and a second support node of a second mobile network to inspect packet flows that traverse a network boundary between the first mobile network and the second mobile network, a roaming protocol control plane message originated by the first support node and directed to the second support node to request that the second mobile network establish a subscriber session for a mobile node connected to the first mobile network and associated with a subscriber; generating, with the firewall device, a modified roaming protocol control plane message by modifying the intercepted roaming protocol control plane message to add a discrete information element to or modify a discrete information element of the intercepted roaming protocol control plane message, wherein the intercepted roaming protocol control plane message conforms to a roaming protocol of the first mobile network, and wherein the modified roaming protocol control plane message generated by the firewall device conforms to a roaming protocol of the second mobile network but does not conform to the roaming protocol of the first mobile network, and wherein the discrete information element includes information usable by the second mobile network for establishing the subscriber session; and sending the modified roaming protocol control plane message to the second support node of the second mobile network.