| 摘要 |
<p>A direct communications approach is used to automatically transfer user data from one wireless communications device (100) to another (100). The two wireless communications devices, such as cellular telephones, directly communicate over an intervening medium using light, sound (112, 114), or electromagnetic energy (128) as appropriate. The medium is not 'intelligent,' but is instead passive. Examples of such medium include air, a vacuum, or a passive cable interconnecting the two wireless communications devices. In one preferred embodiment, audio tones, such as four column DTMF tones, are used to transfer the user data.</p> |
