The present invention relates to an arrangement and a method for providing access between a number of user stations connected by ratio via a number of radio base stations (RFP) and a switching arrangement (LE) of a telecommunications network. At least one access network (AN) is provided and it connects to the switching arrangement (LE) over at least one interface. A radio access network (DRAN) comprising a number of base stations (RFP) is provided which also comprise the access network (AN). An address field of the addressing mechanism of the existing in (V5.1) between the access network (AN) and the switching arrangement (LE) is so structured that it comprises a first part for addressing base stations (RFP) and a second part for addressing/identifying selected bearer channel on the existing interface (V5.1).