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ITU-T Recommendation T.35 provides a mechanism for the inclusion of non-standard facilities, which are used in several protocols defined in ITU-T Recommendations. This mechanism uses three types of codes: (a) a country code, (b) a terminal provider code (also known as manufacturer code), and (c) a terminal provider oriented code. The ITU-T Recommendation T.35 country codes are defined within this Recommendation and the terminal provider oriented codes are defined by the manufacturer. However, for the manufacturer code, ITU-T Recommendation T.35 states: “An Administration, or a national body designated by an Administration, has the responsibility for the allocation and management of the terminal provider code”. In order to provide a centralized list of national authorities for the assignment of ITU-T T.35 terminal provider codes, and to assist manufacturers in obtaining such codes, ITU T Recommendation T.35 further states: “When an Administration designates a national body, its address and name should be sent to the Director of TSB.” A list of national authorities for the assignment of ITU-T Recommendation T.35 terminal provider codes has been set up, derived from the responses received to TSB Circular 184 of 12 September 2003 and its Addendum 1 of 30 July 2004. Any new or updated information on the identity of the current national authority designated by each Administration for the assignment of the ITU-T Recommendation T.35 terminal provider codes should be communicated to TSB (preferably electronically, or on paper), to the ITU-T Study Group 16 Secretariat (E-mail: tsbsg16@itu.int, fax: +41 22 730 5853) using the Notification Form.
