ETSI TS 129 018

Digital cellular telecommunications system (Phase 2 ) (GSM); Universal Mobile Telecommunications System (UMTS); General Packet Radio Service (GPRS); Serving GPRS Support Node (SGSN) - Visitors Location Register (VLR); Gs interface layer 3 specification (3GPP TS 29.018 version 4.1.0 Release 4) Edition: 4.1.0
European Telecommunications Standards Institute / 01-Sep-2001 / 58 pages