This figure once again uses the illustration from the previous figures of the home and visited networks. Here, a router has been added to the correspondent's network, labeled "Corresponding agent." A gray arrow, labeled 1 and corresponding to steps given in the text on page 571, extends from the Correspondent Agent to the Home Agent. A gray arrow labeled 2 extends from the Home Agent back to the Correspondent Agent. A blue arrow labeled 3 extends from the Correspondent Agent to the Foreign Agent. And a blue arrow labeled 4 extends from the Foreign Agent to the Mobile Node.