ETSI TS 123 087
ETSI TS 123 087
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); User-to-User signalling (UUS) Supplementary Service - Stage 2 (3GPP TS 23.087 version 4.0.0 Release 4)
standard published 03/01/2001 by European Telecommunications Standards Institute
