The main connection is defined by the selection of the corresponding parameters in the equipment configuration for theCP 1242-7. In this application example the operating mode Telecontrol and the connecting mode Permanent have been selected for the main connection of the Remote Station. This means that the connection setup from the CP 1242-7 must always be routed via a Telecontrol Server (Central Station) and the GPRS connection must always be held. The parameters are described in more detail in document 1, chapter 4.1.