| http://www.w3.org/ns/prov#value | - We seek comment on any technical, cost, or other barriers that exist, as well as on which carriers offer blocking, what specific types or categories of charges are blocked (e.g. charges from non-carriers, from presubscribed carriers, from carriers other than presubscribed carriers, for vertical services), whether an additional charge applies for blocking, the amount of the charge, if any, and how
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