Patent ID: 8085715

Claim:
A method of determining the validity of an IP-transport connected base station for a mobile device to communicate through, the method comprising: receiving an initiation signal from the mobile device via the base station; identifying the base station forwarding the initiation signal, wherein identifying the base station includes identifying the base station by determining a base station identifier allocated to the base station; determining whether the identified base station is a valid base station; and transmitting an appropriate response signal to the mobile device, and the method further comprising at least one of the following: (i) comparing the base station identifier of the base station against a list of base station identifiers of predesignated valid base stations, and determining that the base station is a valid base station if there is a match, (ii) comparing the base station identifier and a routing identifier of the base station against a list of base station identifiers and routing identifiers of predesignated valid base stations, and determining that the base station is a valid base station if both match, and (iii) comparing the base station identifier and a telephone number of the base station against a list of base station identifiers and telephone numbers of predesignated valid base stations, and determining that the base station is a valid base station if both match.