ETSI TS 101 348 Digital cellular telecommunications system (Phase 2+) (GSM); General Packet Radio Service (GPRS); Interworking between the Public Land Mobile Network (PLMN) supporting GPRS and Packet Data Networks (PDN) (GSM 09.61 version 6.4.0 Release 1997)

standard by European Telecommunications Standards Institute, 02/01/2001