| http://www.w3.org/ns/prov#value | - The DTMF signals received from a user's telephone are interpreted by the IVRU, which also communicates with the user by generating and transmitting voice or other audio signals, such as a list of IVRU menu options. [0329] A buyer device 2800 may be, for example, a Personal Computer (PC), a Personal Digital Assistant (PDA), a wired or wireless telephone, a one-way or two-way pager, a kiosk, an Auto
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