ETSI is a recognized organization under the ITU-T (formerly CCITT) arc. The formal rules governing assignment of object identifier values are given in ETSI EG 200 351. Since the 3GPP technical specifications are based on GSM specifications, which use object identifiers under the ETSI node, it has been decided that the 3GPP specifications will use the same arc. This ensures compatibility between GSM and UMTS / IMT-2000 networks.
The expandable list of object identifiers is available here >>>. To see the formal definition of the object identifiers, see the document cited on the right. The tree is not necessarily complete; further extensions may be included in the referenced document.
This table is presented for information only. The formal definitions of the object identifiers are contained in the referenced documents. At present, only the object identifiers assigned under the ETSI arc are listed; these are assigned with the cooperation of ETSI-MCC acting as the 3GPP Secretariat. Object identifiers under other arcs (itu-t, joint-iso-itu-t ...) do not appear.