This Global System for Mobile communications Technical Specification ( GTS) describes the Supplementary Services belonging to the group Line Identification Supplementary Services. The general aspects, including definitions and recommended provision, of the description of the GSM Supplementary Services are given in GSM 02.04. The group of Line Identification Supplementary Services is divided int o the following four Supplementary Services: CLIP - Calling line identification presentation (clause 1); CLIR - Calling line identification restriction (clause 2); COLP - Connected line identification presentation (clause 3); COLR - Connected line identification restriction (clause 4).