number translation or systems offering equivalent functionality; (d) fixed and mobile networks, in particular for roaming, access to conditional access systems for digital television services; and (e) access to virtual network services. 19. Co-location. (1) Where a licensee has the right to install facilities on, over or under private land or take advantage of a procedure for the expropriation or use of property, the Commission shall encourage the sharing of such facilities and property with other licensees, in particular, where other licensees do not have access to viable alternatives. (2) A service provider providing such co-location shall— (a) file with the Commission a schedule of fees charged for co-location; (b) agree on a meet-point with another licensee seeking interconnection and designating location for interconnecting the network; (c) provide reasonable, just, and non-discriminatory rates, terms and conditions for physical collocation of equipment necessary for interconnection or for providing access to the unbundled network elements at the licensee’s premises; (d) resort to virtual co-location, requiring interconnection at a place outside the licensee’s usual premises such as switching, transmission, or main distribution door frame room if it is demonstrated that physical co-location is not practical for technical reasons or for space limitations; (e) agree with a licensee seeking interconnection on a facility that is based in the central office of either party to complete the transmission; and (f) charge a fee according to filed tariffs. (3) The terms and conditions for co-location or sharing of facilities shall be subject to a commercial and technical agreement between the parties concerned and the Commission may intervene to resolve disputes arising from such agreements. 20. Network access and facilities. (1) A Facilities licensee shall facilitate access to network facilities in the following