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The purpose of the Leaflet is to define, fo all lines not equipped with GSM-R: the use of fixed and portable lineside telephones as provided for train staff, maintenance gangs, station staff, and in some cases for customers, the functionality of the circuits to which the telephones are connected, the technical characteristics, for both telephones and circuits, of: the calling equipment, the supply components, the means of connection of the telephones, the method of installation.