| http://www.w3.org/ns/prov#value | - When the user starts the telephone application module 20a of the computer A and makes a telephone call to the voice mail apparatus 5, the telephone application module 20a issues an address retrieval request to the directory server 23 on the basis of the destination telephone number (Step 1) and obtains information such as the telephone number, telephone address, and kind of telephone of the voice
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