1. A home subscriber server (HSS) for being in charge of subscriber data for subscribers of a home network that includes multimedia infrastructure operating in accordance with a 3GPP IP Multimedia subsystem, the home subscriber server comprising: means for receiving from a selected access network information about the access location of a subscriber (DE) including an identifier of an access entity in the selected access network where the subscriber has accessed through: a user profile for subscriber, the user profile including a number filtering criteria that may be applied to subscriber messages depending on a type of call: first processing means for deriving a country code (CC) from the received identifier of the access entity; second processing means for determining in accordance with subscriber preferences whether the country code derived, or the country code of the home network is included in the information about the access location of the subscriber: and means for submitting the information about the access location of the subscriber along with the user profile towards a serving call session control function (S-CSCF) entity assigned to the subscriber in the home network.