1. A Home Subscriber Server (HSS) database node comprising: an application processing layer configured to provide HSS functionality specific to the HSS database node; and an interface for connection to an Internet Protocol (IP) network, wherein the interface is isolated from the application processing layer, and wherein the interface comprises: a port configured to receive a request for information from a network node connected to said IP network; a processor configured to determine if said HSS database node can respond to said request using the application processing layer; and a transmitter configured to forward the request to another HSS database node if said HSS database node cannot respond to the request for information on the IP network.