Cap. 173 Rev. 1985 Subsidiary Legislation Telecommunications 8-13 (b) if it is listed in the telephone directory at the request of the subscriber otherwise than as residential premises, or if the number allotted to the connection is used in business advertisements or communications; (c) if in any other way it is, in the opinion of the Permanent Secretary, being used for business or professional purposes. Public: telephones and rented coinbox telephones 37.—(1). Public call offices.and public telephones may be provided at convenient points. : : (2) The charges for local-calls ‘made from a public telephone shall be as prescribed in the First Schedule and the charges for trunk calls made from a public telephone shall .be as prescribed in the Second Schedule. . (3) The charges payable by users for calls from a-rented coin box’ telephone shall be the same as for calls for a public telephone, but a subscriber renting the coin box telephone shall be debited’with charges as prescribed for a subscriber’s telephone in the First Schedule to these Regulations or.in the Second Schedule to these Regulations, and may retain the difference. : : (Substituted. by :Legal Notice .72 of 1970.) 38. Unit period of conversations . * ‘ The unit period of conversations shall be 3 minutes, reckoned from the . time ‘the caller is informed that the connection .required is established. Extension of conversations 39. Coversations may be prolonged provided that the full fee is paid for each further unit period, but the Permanent Secretary shall have the right to terminate any conversation commencement. after the expiration . of 6 minutes co Call office instructions to be observed from: the. wo time : of its - 40. The instructions in the public call office directing users as to the procedure to be. followed to obtain connection shall be. precisely observed; otherwise connection will not be made even if an assurance is: given that the’ coin has been deposited. . Extension lines 41. Extension lines, either within or beyond the building or premises to which the exchange line from which they are extended connects, may be provided at the discretion of the Permanent Secretary and upon payment of the prescribed charges. wee Private branch exchanges : ss 42. .Private branch. exchanges may be provided and installed at-a subscriber's premises at.the discretion of the Permanent Secretary and.upon payment of the prescribed charges. The subscriber shall provide, at his own, cost, all necessary operating attendants at the private branch exchange. oo . 43. ne Party tines - Fo, At the discretion of the Permanent Secretary party-exchange.lines may be ponent provided at reduced tariff rates if the parties are situated within an exchange radius and their premises are located within a reasonable distance of each other. When by :