Software module as basic software for unidirectional data coupling of fire detection system (FDS) to a Clinos system FAT 3000 (ESPA 4.4.4.). As a media gateway, the software module implements incoming data information of the FDS into call information for further processing (e.g. display) in the call system. Configuration of the necessary display texts in FAT, which are transmitted in clear text (coming and going message), as will as the option of allocating unique ID codes in the call system. Received messages of the FDS are passed on for secondary alerting to the call system and to other system software, e.g. a graphic user interface.