Patent ID: 8023946

Claim:
A method of performing a binding procedure for a mobile node in a foreign network, the mobile node having roamed from a home network and having a home packet data protocol address, the method comprising: the mobile node sending the home packet data protocol address to an allocating node of the foreign network; the allocating node allocating or participating in the allocation of an allocated packet data protocol address to the mobile node; the allocating node receiving a received packet data protocol address of a receiving node; the allocating node receiving a signal from a Serving General Packet Radio Service (GPRS) Support Node (SGSN); in response to the signal and based on the home packet data protocol address, the received packet data protocol address, and the allocated packet data protocol address, the allocating node sending or arranging for another network node to send a message to the receiving node, the message indicating a binding between the allocated packet data protocol address and the home packet data protocol address of the mobile node; wherein the receiving node is a home agent of the mobile node in the home packet data network; and wherein the mobile node sends the received packet data protocol address of the home agent to the allocating node.