| http://www.w3.org/ns/prov#value | - The DTMF signals received from a user's telephone are interpreted by an IVRU server, and the server may also communicate with the user by generating and transmitting voice or other audio signals, such as a list of IVRU menu options. [0542] The purchasing system device 5900 arranges for the buyer to purchase the product, for example, when a buyer offer is received from a buyer device 200 through th
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