Abstract: The invention relates to a telecommunication device having software that is used for controlling function routines, which software includes several separately compilable program units. To reduce the time necessary for manufacturing the telecommunication device and the time necessary for implementing software changes, the program units each have a header which contains addresses (Ap1, Ap2, Ad) used for addressing procedures and/or data combined in the program units. Furthermore, a catalogue is provided which is available to all the loaded program units, which catalogue contains references for addressing the headers of the program units. Within the framework of the manufacture of the telecommunication device, the predefined program units need not be linked when the software of the telecommunication device is implemented.