A mobile communications network can establish one or more communications bearers for communicating data packets to/from a communications terminal via a radio network and a core network, each of the communications bearers established using context information associated with connections from the communications terminal to destination addresses, or to the communications terminal from source addresses. The communications terminal can, in an idle state, communicate a short signalling message data packet to a base station of the radio network, using predetermined parameters for configuring a mobile communications terminal transmitter, which correspond with parameters with which a receiver in the base station can receive the short message data packet, the short message data packet including an indication of context information usable by the mobile communications network for communicating the short message data packet to a mobility manager of the mobile communications network. The short message data packet can be context-less or quasi-context-less.