ITU-T Q.2951

Stage 3 description for number identification supplementary services using B-ISDN Digital Subscriber Signalling System No. 2 (DSS 2) - Basic call - Clause 1: Direct Dialling-In (DDI), Clause 2: Multiple Subscriber Number (MSN), Clause 3: Calling Line Identification Presentation (CLIP), Clause 4: Calling Line Identification Restriction (CLIR), Clause 5: Connected Line Identification Presentation (COLP), Clause 6: Connected Line Identification Restriction (COLR), Clause 8: Sub-addressing (SUB)