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 6.8.1 Release 1997)
standard published 12/01/2000 by European Telecommunications Standards Institute