The present document defines the second version 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.
From release 8 onwards, the normative specification of the user plane of GTP version 1 is TS 29.281
. All provisions about GTPv1 user plane in the present document shall be superseded by TS 29.281
The present document specifies functions, procedures and information which apply to GERAN Iu mode. However, functionality related to GERAN Iu mode is neither maintained nor enhanced.