PTA may in addition set conditions concerning the operating reliability of networks, ensuring the compatibility of networks and integration of various services. To ensure the security of the country's electronic communications with the outside world, PTA may set the requirement that electronic communications undertakings operating telephone or data transmission connections with foreign countries use more than one route for the purpose and that the undertakings take measures to transfer telephone and data transmission services from an inoperative or severed route to another viable route within time limits set by the PTA. PTA may set requirements that owners of an electronic communications undertaking with significant market power do not weaken the undertaking's economic situation or take other abnormal measures which would substantially reduce the undertaking's possibility of fulfilling its obligations under this Act. PTA may place special obligations on undertakings operating an electronic communications network or electronic communications service, in accordance with the provisions of this Act on access, interconnection and universal service. 1)Reg. 86/2002. CHAPTER IV Assignment of frequencies and numbers Article 7 Rights to use frequencies and numbers Where rights to use specific frequencies and numbers are not covered by sub-paragraph p of the second paragraph of Article 6, PTA shall, upon receiving an application, assign such rights to electronic communications undertakings which operate or use electronic communications networks or services under a general authorisation. Rights to use frequencies may also be assigned to radio broadcasters following open, transparent and nondiscriminatory procedures, if such assignment serves the purpose of the authorities. Rights to use frequencies may also be assigned to parties operating wireless electronic communications equipment for their own purposes. Rights provided for in this Article shall be linked to one name and may not be transferred. Article 8 Merger and splitting up of undertakings If an electronic communications undertaking holding rights to use frequencies is involved in a merger, PTA may cancel these rights to use frequencies in part or in full, or change the conditions for the rights if there is a danger that this will interfere with competition or effective use of the frequency spectrum, or if the premises for granting rights to frequencies are substantially altered in other respects or no longer exist. 6/34