| http://www.w3.org/ns/prov#value | - The present invention particularly relates to a solution to current problems: a problem of a single-ring trap call which leaves a caller's phone number in a call register in order to make a user call back the caller's phone number according to the call register, to be connected to a number, such as a dial Q2, which will charge the user a large amount of communication charge, or a problem of making
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