ETSI EN 301 347
ETSI EN 301 347
Digital cellular telecommunications system (Phase 2+) (GSM); General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp Interface; (GSM 09.60 version 6.4.1 Release 1997)
standard published 11/01/1999 by European Telecommunications Standards Institute