(3) (Amended, SG No. 105/2011, effective 29.12.2011) The Commission shall adopt functional specifications for number portability under Paragraph (1) after a public consultation under Article 36 herein and shall promulgate the said specifications in the Official Section of the State Gazette. (4) The functional specifications shall contain: 1. technical conditions for implementation of portability; 2. action that the undertakings which are obligated to ensure portability must take, including time limits for implementation of such actions; 3. method for implementation of portability; 4. requirements regarding the database required to ensure the routing; 5. obligations of the undertakings which ensure the portability, and reasons for a refusal to provide the service to end-users; 6. procedure for implementation of portability; 7. principles of pricing and apportioning the costs among undertakings. (5) (New, SG No. 105/2011, effective 29.12.2011) The procedure for porting of numbers shall be implemented within the shortest possible time fixed in the functional specifications referred to in Paragraph (3). (6) (New, SG No. 105/2011, effective 29.12.2011) The period for which the provision of the service to the subscriber is discontinued may not exceed eight hours. Article 135. (Repealed, SG No. 105/2011, effective 29.12.2011). Article 136. (1) (Amended, SG No. 17/2009, SG No. 105/2011, effective 29.12.2011) The undertakings providing electronic communications networks and/or services shall determine among themselves prices related to the implementation of number portability as follows: 1. a lump-sum price covering the costs in connection with a verification of the identity of a subscriber or user and for other activities related to administrating the process of porting a number; 2. prices for interconnection associated with the changing of the undertaking referred to in Article 134 (1) herein respecting the principle of cost orientation. (2) (Repealed, SG No. 105/2011, effective 29.12.2011). Article 136a. (New, SG No. 105/2011, effective 29.12.2011) In the cases where there are charges to end-users for porting a number, the undertakings referred to in Article 134 (1) herein shall determine the said charges in a manner that does not act as a disincentive against changing the undertaking providing the respective service. Article 137. (Amended, SG No. 17/2009, repealed, SG No. 105/2011, effective 29.12.2011). Article 138. (Repealed, SG No. 105/2011, effective 29.12.2011). Section III (New, SG No. 105/2011, effective 29.12.2011) Access to Numbers and Services Article 138a. (New, SG No. 105/2011, effective 29.12.2011) Any undertaking, which has been granted an authorization for use of a number range from the National Numbering Plan, shall not have the right to set discriminatory conditions to other undertakings providing electronic communications services in connection with the access to services of the said undertakings provided through numbers from the said range. Article 138b. (New, SG No. 105/2011, effective 29.12.2011) The undertakings providing electronic communications services and ensuring a possibility to make outgoing calls to numbers from the National Numbering Plan shall ensure end-users access without charge to the single European emergency call number "112" and to the national emergency call numbers. Article 138c. (New, SG No. 105/2011, effective 29.12.2011) (1) The undertakings providing public electronic communications services, where technically and economically feasible, shall ensure all