| 摘要 |
<p>The system has a gateway mobile switching centre (GMSC) switch installed in a country. An auxiliary network has roaming agreements with home public land mobile network (HPLMN) and visited public land mobile network (VPLMN). A roaming hub records a mobile location with subscriber identity module card and updates a register of the mobile network to indicate the network (HPLMN) like the network (VPLMN). The hub controls return calls toward the switch and passes the incoming calls to a roaming number. The switch uses operators of international telephone network to emit calls toward the mobile.</p> |
