| 摘要 |
A device having a first configuration includes an input unit configured to accept an input made by a user, and a transmitting unit configured to add a safety confirmation number accepted by the input unit to a first call control signal and to transmit the first call control signal with the safety confirmation number. A device having a second configuration includes a storing unit configured to store a safety confirmation text and a safety confirmation number by associating the safety confirmation text with the safety confirmation number, and a display unit configured to display the safety confirmation text that is stored in the storing unit correspondingly to the safety confirmation number added to a received first call control signal.
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