Patent ID: 7079849

Claim:
A wireless telecommunication network roaming method, comprising: receiving an incoming roaming call at a home mobile switching center; verifying that an account balance associated with a roaming subscriber is sufficient to receive the roaming call; delivering the roaming call to the roaming subscriber, including: receiving a temporary local dialed number associated with the roaming subscriber from a roaming server, extending the roaming call from the home mobile switching center to a serving mobile switching center using the temporary local dialed number, receiving the extended roaming call at the serving mobile switching center and, routing the roaming call from the serving mobile switching center to the roaming subscriber; translating the account balance into a maximum call duration; while monitoring the roaming call: timing the roaming call to create a call duration, and disconnecting the roaming call if the call duration exceeds the maximum call duration; and after the roaming call is disconnected, decrementing the account balance based on the call duration.