Registration scheme for network

A data network coupled to a foreign network that includes a foreign mobile switching center and a foreign base station linked together using an XTunnel protocol, the foreign mobile switching center including a serving registration server, the foreign base station including a foreign access hub, the foreign access hub including a proxy registration agent for discovering a point of attachment to the network, the data network comprising:

• a home network that includes a home mobile switching center with a home registration server;
• a first mobile end system subscribed to the home network and operating within the foreign network, the first mobile end system including an end registration agent, the end registration agent being coupled to the proxy registration agent, the proxy registration agent being coupled to the serving registration server, the serving registration server being directly coupled to the home registration server using an XTunnel protocol.

A data network coupled to a foreign network that includes a foreign mobile switching center and a foreign base station linked together using an XTunnel protocol, the foreign mobile switching center including a serving registration server, the foreign base station including a foreign access hub, the foreign access hub including a proxy registration agent for discovering a point of attachment to the network, the data network comprising:

• a home network that includes a home mobile switching center with a home registration server;
• said home network having a first mobile end system subscribed to the home network and operating within the foreign network;
• said home registration server being directly to a serving registration server using an XTunnel protocol, the serving registration server being directly coupled to the proxy registrations agent which receives a request for mobile service from the first mobile end system.

A coupled data network, comprising:

• a foreign network that includes a foreign mobile switching center and a foreign base station linked together using an XTunnel protocol, the foreign mobile switching center including a serving registration server, the foreign base station including a foreign access hub, the foreign access hub including a proxy registration agent for discovering a point of attachment to the data network, said foreign network operating with a first end system;
• said proxy registration agent receiving a request for mobile service from an end registration agent of the first end system, the proxy registration agent being directly coupled to the serving registration server using the XTunnel protocol, the serving registration server being directly coupled to a home registration server in a home network using the XTunnel protocol.