Electronic and Postal Communications (Electronic Communication Numbering and Addressing) G.N. No. 428 (contd) “Signalling Point Codes” “in its abbreviation SPC” means codes used in the networks to identify the exchanges national or international between which speech path connections are to be established; “tzNIC” means the Tanzania Network Information Centre entrusted to serve both as the technical and administrative Manager of dot-tzccTLD; “tzccTLD” means country code Top Level Domain for Tanzania; "Unstructured Supplementary Service Data” in its abbreviation USSD means a Global System for Mobile (GSM) communication technology that is used to send text between a mobile phone (using a number that contains at least one occurrence of a star (*) or a harsh (#)) and an application program in the network; “utilised numbers” means numbers that are allocated to customers or kept for internal system and human communications or that have been distributed to a dealer on SIM cards; “VAS short code” means an electronic communications number designated for Value Added Services; “Value Added Services” in its abbreviation VAS means extra electronic communication services as provided by an assignee other than basic telecommunications services. PART II ELECTRONIC COMMUNICATION NUMBERING AND ADDRESSING Power of the Authority 4. The Authority shall maintain control of all electronic communication numbers and addresses to ensure fair and efficient use by(a) performing proper planning, allocations, assignment and monitoring; (b) maintaining the national electronic communication numbering register for all carriers and operators in respect of resources 161