| 摘要 |
The method involves broadcasting a message on the radio which invites listeners to put the microphone (51) of their telephone handset (50) near to the radio (3). This establishes an audio link between the radio loudspeaker and the telephone handset. The radio station broadcasts a DTMF signal which is picked up by the listener's radio and sent to the microphone of their telephone handset. This causes the telephone to dial the telephone number of the centre (9) handling calls to the radio station. The call centre is then able to select at random one of the callers in order to establish a conversation between the radio announcer and the caller.
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