; and (bb) shall require the receiving provider to notify the receiving subscriber of the existence of the circumstances described in subclause (II) of this clause. (ii) Whitelisting (I) Request An originating subscriber that offers essential services (referred to in this clause as an essential services subscriber ) may request that the Commission require each receiving provider to allow receiving subscribers of the receiving provider to receive calls or text messages originating from the essential services subscriber. (II) Grant If the Commission, through a rigorous vetting process using the unblocking system established under clause (iii), confirms the identity of an essential services subscriber described in subclause (I) of this clause, the Commission shall require each receiving provider to allow each receiving subscriber of the receiving provider to receive calls or text messages originating from the essential services subscriber unless the receiving subscriber has requested under subparagraph (B)(ii)(III) that the receiving provider prevent the receiving subscriber from receiving calls and text messages originating from that essential services subscriber. (III) Definition of essential services The Commission shall by regulation define the term essential services for purposes of this clause. (iii) Unblocking system and database (I) In general In order to carry out this subparagraph and ensure that consumers are in control of the calls and text messages they receive, the Commission shall establish a nationwide unblocking system that includes a database, to be known as the Unblocking Database , of originating subscribers whose identity the Commission has confirmed under clause (ii)(II). (II) Funding The Commission shall— (aa) assess a fee on any originating subscriber that wishes to participate in the nationwide unblocking system