Patent ID: 7725104

Claim:
A local calling area (LCA) determination system in a wireless network for determining whether calls are in a home LCA, the LCA determination system comprising: a mapping data structure having a plurality of entries that map a switch/cell identifier associated with a switching system and a cell site in the wireless network to a set of LCA identifiers, wherein a sector identifier is masked in the switch/cell identifier in the entries of the mapping data structure; and a processing system adapted to receive a switch/cell identifier associated with a switching system, a cell site, and a cell sector serving a subscriber for a call in the wireless network, to identify a type of the switching system serving the subscriber, to identify a sector identifier in the switch/cell identifier based on the type of the switching system, to mask the sector identifier in the switch/cell identifier to determine a masked switch/cell identifier, to search the mapping data structure based on the masked switch/cell identifier to identify a set of LCA identifiers mapped to the masked switch/cell identifier, to identify a subscriber profile for the subscriber, to compare the identified set of LCA identifiers to the subscriber profile to determine if at least one of the identified set of LCA identifiers is included in the subscriber profile, and to determine that the call is in a home LCA responsive to determining that at least one of the set of LCA identifiers is included in the subscriber profile.