if no such indication is found the setting up of the connection continues normally if such an indication is found the mm entity at the network side informs 130 corresponding mm entity in the ms about those events which in the case of only one mm protocol being used would be implicitly signalled by rrc level events for example such an event could be the succesful establishment of the mm level connection the step of informing 130 could in such a case be an explicit acknowledgment of the establishment of the mm connection for example by sending a cm service accept message the step of informing may take place at a later point during the setting up of the mm connection or for example after the setting up of the connection fig4 illustrates another example of a method according to an advantageous embodiment of the invention this example shows events during releasing of a connection such events could take place for example when connections between a mobile station and a cn element are released in the first step 205 a core network element releases the connections between itself and the rnc i e the iu interface connections in the next step 210 the rrc protocol control entity in the rnc checks if any other iu connections to another cn element remain if iu connections to other cn.