Abstract: A method, a terminal device, a node, a program module, and a user interface for determining features required for a communication relation. An input device (IN) determines initial features as input values (INPUT) which are necessary for classification of the communication relation and transmits them to a sort device (SORT) which sorts the initial features into feature groups, with the first feature group (INKP) comprising those of the initial features which concern at least two communications partners to participate in the communication relation; a second feature group (INDT) is comprised of those of the initial features which concern at least one data type to be transmitted in the framework of the communication relation; and a third feature group (INCT) which comprises those of the first features which concerning at least one connection type for the communication relation.