“tariff” means a tariff approved by the Commission under CHAPTERVI of this Act or a tariff mentioned in section 92 {ref. clause (16)}; “technical acceptance certificate” means a technical acceptance certificate issued by the Commission under section 57 {ref. clause (7)}; “telecommunication” means transmission and reception of any speech, sound, sign, signal, writing, visual image or any other intellectual expression by way of using electricity or electro-magnetic or electrochemical or electro-mechanical energy through cable, pipe, radio, optical fibre or other electro-magnetic or electro-chemical or electromechanical or satellite communication system {ref. clause (11)}; “telecommunication apparatus” means an apparatus used for transmission or reception of anything that falls within the purview of the definition of telecommunication {ref. clause (12)}; “telecommunication network” means a combination of a set of nodes and links that establish telecommunication between two or more points {ref. clause (14)}; “telecommunication service” means any of the following services:(a) transmission or reception, with the help of a telecommunication system, of anything that falls within the purview of the definition of telecommunication; (b) any value added telecommunication service (e.g. fax, voice mail, paying service); (c) internet service; (d) supply of information or directory relating to a telecommunication system for the convenience of using a service intentioned in (a), (b) and (c) above; (e) a service for installation, or maintenance of telecommunication apparatus, or a service relating to the adjustment, alteration, repair, moving or replacement of such apparatus {ref. clause (15)}; “telecommunication system” means a combination of the telecommunication apparatus (e.g. switching system, transmission Page 10 of 87