Electronic and Postal Communications (Electronic Communication Numbering and Addressing) G.N. No. 428 (contd) (d) (e) (f) association; company profile; Taxpayer’s Identification Number (TIN); physical and mailing address. Auditing of electronic communication numbers 8. An assignee shall submit in writing to the Authority on any date in the month of May of each year, the utilized electronic communication numbers for the purposes of auditing and billing. Assignee obligations 9.-(1) Any assignee shall use the electronic communication numbers as assigned by the Authority and in accordance with the national numbering plan and shall ensure that the resources are(a) utilised efficiently; (b) limited to provision of electronic communication services; (c) utilised in a manner that electronic communication facilities or services may be identified; and (d) utilised and paid for as designated by the Authority in accordance with the application guidelines and fees for numbering resources as may be provided and reviewed by the Authority from time to time. (2) An assignee shall not re-sell or trade any part of the assigned electronic communication numbers to a third party. (3) An assignee shall be responsible for discontinuation of traffic related to a numbering resource whose service has ended. Use, registration and management of dot-tz electronic addresses and names 10. Any public or business entity in Tanzania shall register and use domains with country’s ccTLD, the dot-tz. (2) Dot-tz Electronic Communications shall be used for all official correspondences unless where proved technically not possible. (3) The Tanzania Network Information Centre 164