ETSI TS 124 010
ETSI TS 124 010
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Mobile radio interface layer 3 Supplementary services specification; General aspects (3G TS 24.010 version 3.1.0 Release 1999)
standard published 06/01/2000 by European Telecommunications Standards Institute