Paragraph 28.2
Pursuant to a request for Portability made to it by an Operator or a Service Provider, the Licensee shall provide Portability (other than Mobile Portability or Paging Portability) in relation to that request on reasonable terms in accordance with the Functional Specification and with the following provisions provided that any charges for provision of such Portability shall be made by the Licensee in accordance with the following principles:
subject always to the requirement of reasonableness, charges shall be based, unless the charges made by British Telecommunications plc for the provision of telecommunication services under Condition 69 of its Licence granted under section 7 of the Act shall be incremental costs, in which case the basis for charges shall be incremental costs, on the fully allocated costs of providing Portability unless the Donor and Recipient Operator shall have agreed another basis for charges, or the Director shall have determined, following an application by either of them, that another basis for charges should be used;
the Donor Operator shall make no charge in relation to any System Set-Up Costs;
subject to sub-paragraph 28.2 (b), the Recipient Operator shall pay charges based on the reasonable costs incurred by the Donor Operator in providing Portability with respect to each Number which, subject to sub-paragraph 28.2 (d) may be paid by way of specific elements of the provision of the facility;