| http://www.w3.org/ns/prov#value | - g a question about a subject and a call identifier in said queue, said message offering an option for the first caller to listen at least to a conversation relating to said subject, wherein said conversation is an in-progress call between an agent and a caller; and c) means responsive to said means b) indicating acceptance by said first caller of said offer, for arranging for said first caller to
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