Electronic and Postal Communications (Electronic Communication Numbering and Addressing) G.N. No. 428 (contd) (c) National Numbering Plan Management which have been assigned; and maintaining registers of the national dot-tz electronic addresses and users. 5.-(1) National numbering plan shall electronic communication numbers used to identify(a) (b) (c) (d) (e) (f) (g) (h) include electronic communication networks or various carriers; terminal facilities for cellular phones; signalling transmission equipment; emergency, help, health and inquiry calls; terminal transmission line facilities for data communication services; Unstructured Supplementary Service Data (USSD) applications; Value added services; and terminal transmission line facilities for paging services, space for future technological developments . (2) The Authority shall maintain and update the National Numbering Plan as appropriate. Procedure for Assignment of electronic communications numbers 6.-(1) The eligibility for assigning electronic communication numbers(a) all telecommunications network operators and service providers licensed by the Authority to operate in the United Republic shall be eligible for assignment of electronic communications numbers; (b) unlicensed entities may apply for VAS short codes subject to the nature of Value Added Services to be provided; (c) unlicensed entities shall be assigned to one VAS short code; and where more than one VAS short code is required, the applicant shall be obliged to have the appropriate license as 162