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ETSI TS 129 281
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ETSI TS 129 281 Universal Mobile Telecommunications System (UMTS); LTE; General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U) (3GPP TS 29.281 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 03/01/2017
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ETSI TS 129 281 defines the user plane of GTP used on: the Gn and Gp interfaces of the General Packet Radio Service (GPRS); the Iu, Gn and Gp interfaces of the UMTS system; the S1-U, S2a, S2b, X2, S4, S5, S8, S12, M1 and Sn interfaces of the Evolved Packet System (EPS);This definition ensures full backwards compatibility with RNC, SGSN and GGSN implementations according to release7 of 3GPP TS 29.060 [6].NOTE: Releases previous to Release-8 have used 3GPP TS 29.060 [6] as normative definition of the user planeof GTP. This shall be considered when essential corrections are included in the present document or inpre-release-8 version of 3GPP TS 29.060 [6].
Fallback from GTPv1-U to GTPv0-U shall not be supported. Therefore, 3GPP Rel-8 and onwards GTPv1-U entityshould not listen to the well-known GTPv0 port 3386. If GTPv1 entity listens to the GTPv0 port, the entity shall silentlydiscard any received GTPv0-U message.