A multimedia call session control method for use in a cellular mobile radio system, the method including: performing a negotiation operation for determining the characteristics of the components of the session, and allocating resources based on characteristics determined in the negotiation step, wherein the negotiation step includes informing at least one of the parties to the call is informed of the capacities of its server radio access network, at least in its server cell, and taking into account the capacities of the server radio access network in the negotiation, in order to be able to allocate corresponding resources.