ETSI TS 124 087
ETSI TS 124 087
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); User-to-User Signalling (UUS) Supplementary Service - Stage3 (3G TS 24.087 version 3.0.0 Release 1999)
standard published 01/01/2000 by European Telecommunications Standards Institute