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 (3GPP TS 24.010 version 4.2.0 Release 4) Edition: 4.2.0
European Telecommunications Standards Institute / 01-Dec-2001 / 33 pages