Provided that where the operator licensed to provide such infrastructure for any cause, is unable to provide such leased capacity within the prescribed time, it may apply to the Commission for an extension of time within which to provide such capacity to the telecommunications service provider. PART VIII — TYPE APPROVAL OF TERMINAL EQUIPMENT Purpose. Categories of network and terminal equipment requiring type 50. Regulations in this Part shall ensure that the connection of apparatus to the telecommunications networks does not damage or jeopardise the integrity of the telecommunications network. 51. (1) All telecommunications and radio communication equipments shall prior to their installation or connection to any public switched telecommunication network in Kenya be submitted to the Commission for type-approval. approval. (2) The Commission shall grant type-approval for each type of equipment once and subsequent users of the same model of equipment shall not apply to the Commission for type approval; Provided that any changes in models, design or specification of any equipment which has been type approved by the Commission shall be resubmitted for type approval. (3) The categories of network and terminal equipment that require type approval shall include(a) telephone equipment; (b) fax machines; (c) private automatic branch exchange (PABXs) (including small business systems and key systems); (d) telex equipments; 44