ETSI TS 129 060 English Printed Edition English PDF Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp Interface (3G TS 29.060 version 3.4.0 Release 1999)

standard published 03/01/2000 by European Telecommunications Standards Institute