The invention relates to a system and method of transferring user data from a communication module to a data processing centre over a telecommunications network. A signalling message is wirelessly received from the communication module in the telecommunications network. The signalling message contains the user data that is subsequently transferred to the data processing centre. By inserting the user data in the signalling message(s), it is possible to rapidly transmit data to the telecommunications network, while resources can be saved since it not required to establish a complete circuit-switched or packet-switched connection between the communication module and the telecommunications network. The user data may comprise application data of a program run by the communication module, e.g. alarming data, measurement data or derivatives thereof.