| http://www.w3.org/ns/prov#value | - Either before or after unidentified caller 14 selects a call destination at step 208, switching system 20 prompts unidentified caller 14 at step 210 to provide an utterance, for example, any sound, word, or phrase, such as the name or account number of unidentified caller 14, that is suitable for comparison with one or more stored utterance identifiers 164 corresponding to one or more known caller
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