Chapter 1 (Articles 1 - 4)
Chapter 2 (Articles 5 - 11)
Chapter 3 (Articles 12 - 17)
Chapter 4 (Articles 18 - 20)
Chapter 5 (Articles 21 - 24)
Chapter 6 (Articles 25 - 26)
Chapter 7 (Articles 27 - 29)
(27) As regards calling line identification, it is necessary to protect the right of the calling party to withhold the presentation of the identification of the line from which the call is being made and the right of the called party to reject calls from unidentified lines. Certain endusers [sic], in particular help lines, and similar organisations, have an interest in guaranteeing the anonymity of their callers. As regards connected line identification, it is necessary to protect the right and the legitimate interest of the called party to withhold the presentation of the identification of the line to which the calling party is actually connected.