A portion of the radio access network of a telecommunications network (18) for the service of a mobile station (MS) connected to a core network. The radio access network portion has plural base stations (BS) that supply respective plural cells (C). As well as plural control nodes (RNCs). Control nodes include a first control node (RNC1) to control a first group of plural base stations and a second control node (RNC2) to control a second group of plural base stations. A multi-cell area (MCA) includes cells supplied by at least some of the second group of base stations. The radio access network portion of a telecommunication network furthermore presents a call control node that stores information regarding the multi-cell area. According to a method to operate a telecommunications network of the invention. To call the mobile station in the multi-cell area, the call control node (1) sends call messages to each of the base stations supplying the multi-cell controlled by the call control node; and (2) sends a call message to any other control node that controls base stations that supply cells in the multi-cell area. The call control node determines which base stations and which other control node (s) should send call messages by consulting a call table (100). Preferably the call control node is one of the control nodes of The radio access network. The call control node is connected to the other control node (s) by an inter-control node link (32) over which the call message was sent.