An apparatus and method for seamlessly providing voice and data services to a user through an access terminal in a mobile communication system including a heterogeneous service & mobility gateway (HSMG) for an interworking service between a circuit network and a packet network, and various access networks...http://www.google.de/patents/US20050047399?utm_source=gb-gplus-sharePatent US20050047399 - Method and apparatus for providing voice and data services in a mobile communication system with various overlapped access networks
