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 3.1.0 Release 1999)
standard published 10/01/2000 by European Telecommunications Standards Institute
