# The Telecommunications (Interconnection) (Number Portability, etc.) Regulations 1999, Paragraph 28.3


Where a request for Portability referred to in paragraph 28.2 has been given, the Licensee or the Operator requesting Portability may refer in writing to the Director for his determination any question as to the reasonableness of:
(a) the request for the provision of Portability, taking into account the technical and operational characteristics of the Licensee’s Applicable Systems and, if relevant, those of the applicable systems of the Operator requesting Portability;
(b) the costs incurred in providing Portability (other than Mobile Portability or Paging Portability);
(c) the categorisation of costs;
(d) the proposed use or use of a higher cost method in proposing to implement or implementing any aspect of Portability (other than Mobile Portability or Paging Portability) where a lower cost method could or ought to have been used;
(e) the charges to be made for providing Portability (other than Mobile Portability or Paging Portability);
(f) the basis for calculating such charges.

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Source: https://www.legislation.gov.uk/uksi/1999/3449/schedule/1/part/II/paragraph/28n3 (the official version)
Page: https://openlegislation.uk/telecommunications-interconnection-number-portability-etc-regulations-1999/schedule-1/part-II/paragraph-28n3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.