Patent ID: 6122499
Filing Date: 2000-09-19
Classification: H04B,H04L,H04M,H04W

Abstract:
In a global mobile satellite communications system, an apparatus for providing an interception capability, the global mobile satellite communications system including a plurality of communicatively linked satellites communicating with mobile users and a plurality of gateway earth stations operatively connecting the plurality of satellites to a plurality of public switched telephone networks, the mobile users communicating with public switched telephone network users via the plurality of gateway earth stations, the apparatus comprising:a master call intercept database in a gateway earth station storing target records of subscribers of the global mobile satellite communications system targeted for call interception by law enforcement agencies;a visitor location register in the gateway earth station storing active subscriber records of subscribers currently registered within a serviceable vicinity of a gateway earth station associated with the visitor location register;a telephony intercept list in the gateway earth station storing active target records of registered subscribers targeted for call interception; andan intercept coordinator in the gateway earth station comparing the target records in said master call intercept database against the active subscriber records in said visitor location register, said intercept coordinator adding an active target record of a targeted subscriber to said telephony intercept list, when said visitor location register includes an active subscriber record of the targeted subscriber.