| 摘要 |
New functions are added to the existing telephone network to provide services of a telecommunications carrier which are intended to deter frauds and crimes committed using telephony. Also, the telephonic circumstances during the commitment of a fraud or crime are preserved to assist prevention of recommitment of a fraud or crime. A voice announcement indicating that a telephone conversation now started will be recorded is issued to a sender in advance. This offers a function that deters frauds and crimes by creating psychological resistance. A warning is issued to the recipient after performing a voiceprint check. The contents of telephone conversations during the commitment of a fraud or crime are played back to provide information necessary to take countermeasures against frauds and crimes.
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