A method of registering a User Equipment, UE, in a communication network, said method comprising the steps of receiving, by a control node in said core network, from an access network, a registration request message for registering a UE in said communication network, transmitting, by said control node, to a subscriber node in said communication network, a subscription request message, wherein said subscription request message requests subscription information for said UE and comprises an identification of a type of said access network, AN, via which said UE registration request message is received and an identification of a Radio Access Technology, RAT, used by said UE for connecting to said access network, receiving, by said control node, from said subscriber node, a subscription response message comprising said subscription information for said UE based on said AN and said RAT and transmitting, by said control node, to said UE, a registration complete message for indicating that said UE has registered in the communication network.