ETSI TS 101 346

Digital cellular telecommunications system (Phase 2 ) (GSM); General Packet Radio Service (GPRS); Serving GPRS Support Node (SGSN) - Visitors Location Register (VLR); Gs interface layer 3 specification (GSM 09.18 version 7.2.0 Release 1998) Edition: 7.2.0
European Telecommunications Standards Institute / 01-Nov-1999 / 52 pages