This TS 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.
The version number used in the message headers is 0 for the first version of GTP described in
, and 1 for the second version in TS 29.060
From release 8 onwards, the normative specification of the user plane of GTP version 1 is TS 29.281
provisions about GTPv1 user plane in the present document shall be superseded by TS 29.281