The invention relates to a method for selecting radio resources for a communication session in a wireless communication terminal. In order to facilitate the selection of quality of service between diversified terminals, terminal capabilities are described by a set of capability parameters, the set including at least one parameter indicative of the terminal's capabilities. Based on the set of capability parameters, a dedicated quality class set is defined for an application instance residing in the terminal, the quality class set including at least one quality class for the application instance. When a session is to be established between at least two application instances residing respectively in at least two terminals, at least one quality class is negotiated for the session, the at least one quality class being determined based on the dedicated quality class sets of the at least two application instances. Based on the negotiation, radio resources are then allocated for the session.