Abstract: A system and method for routing an emergency services call from a mobile station to a selected Public Safety Answering Point (PSAP) in a radio telecommunications network. The system intelligently selects the PSAP from a plurality of PSAPs, warns the selected PSAP that the emergency services call is coming prior to routing the call to the selected PSAP, and provides the selected PSAP with advanced information regarding the context of the call. The emergency services call is received by a serving mobile switching center (MSC) which determines that the call is an emergency services call and sends cell or sector information to a service control point (SCP). The SCP includes a PSAP selector which selects the PSAP based on such information as, for example, the location of the mobile station, the Local Access and Traffic Area (LATA) in which the mobile station is located, the time-of-day, and the day-of-week.

Abstract: A pair of home location registers (HLRs) are associated with each other by assigning two capability codes. A first capability code is utilized to provide system support by one of the HLRs whenever the other HLR fails. The second capability code is utilized to constantly update each other's database with the latest subscriber information. Whenever a particular HLR fails, the associated Signal Transfer Points (STPs) reroutes the incoming signals intended for that failed HLR to its mate HLR. The mate HLR compares the received signals' destination point code with its first capability code to determine whether it is allowed to process this signal. If there is a match, the mate HLR automatically and transparently processes the received signal without service interruption or delay. Whenever one of the HLRs receives a new subscriber data, the same data are communicated to the other HLR by using its second capability code as the destination address.