Abstract: The present invention relates to a method, network element and terminal device for providing access to a core network via at least a first (20) and a second (30) access network, wherein a connection parameter requested by a terminal device (10) during a connection set up is detected at a network element (40) of the core network and compared with a corresponding capability of the network element (40). Then, information for indicating a change to another one of the first and the second access networks is transmitted from the network element (40) towards the first access network (20), if the corresponding capability does not match with the requested connection parameter. Thereby, a seamless change of the access networks can be provided without refusing the connection set up or downgrading the requested connection parameter.