Patent ID: 7917136

Claim:
Apparatus for a radio communication system having a mobile node operable to communicate with a network part of a communication network, and at least a first service center coupled to the network part, the mobile node associated with a home network of the communication network a call originated at the mobile node selectably routable to a selected one of the at least the first service center to form a call connection therebetween, said apparatus for facilitating routing of the call to the selected one of the at least the first service center, said apparatus comprising: a first storage element configured to store first codes that identify at least the first service center when the mobile node is positioned at the home network, a selected one of the first codes entered at the mobile node when initiating origination of the call to the selected one of the at least the first service center; a second storage element configured to store second codes used at a non-home network part of the communication network at which the mobile node is presently registered; an indexer coupled to said first storage element and to said second storage element, said indexer configured to receive second codes, store said second codes in said second storage element and to index together the selected one of the first codes, when used to initiate the origination of the phone call, to a corresponding one of the second codes; and a message detector coupled to the indexer, the message detector configured to receive a short message service (SMS) message received by the mobile node pursuant to mobile-node registration, the SMS message comprising second codes encapsulated in an envelope command message, the message detector additionally configured to recover from the SMS message, second codes and to provide the recovered second codes to the indexer for storage into the second storage element, wherein the network part of the communication network includes a first network portion and a second network portion, the first network portion configured to use a first set of the second codes and the second network portion configured to use a second set of the second codes and wherein the first network portion comprises a first coverage area and the second network portion comprises a second coverage area, and wherein the mobile node registers with the network part when passing from the first to the second coverage area, and, upon registering, storing the second set of the second codes in place of the first set of the second codes at said second storage element.