A system for sending a data packet from a messaging device to a receiving device in a signalling network (210) is described. The system comprises a distributed service center (255) a message receiving service center (290), a plurality of signalling units (260, 270) for passing the data packet to the receiving device, a central routing logic (280) for routing the data packets and a closed network connecting at least the central routing logic (280) and the plurality of signalling units (260, 270). Also disclosed is a corresponding method for sending a data packet from a messaging device to a receiving device.