Methods, systems, and computer program products for determining a serving home subscriber server (HSS) in a communications network are described. One method includes obtaining a subscriber identifier from a query message. An exceptions-based data structure contained in a database is accessed to locate...http://www.google.ca/patents/US7996541?utm_source=gb-gplus-sharePatent US7996541 - Methods, systems, and computer program products for identifying a serving home subscriber server (HSS) in a communications network
