| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to give a notice to a desired opposite person about information of a sender who makes receive interrupt for transfer call. SOLUTION: When a calling person (C) calls for communicating with the transfer destination during engagement in call between a sender (A) and a transfer destination (B) through a receiving line wire 11A and a sending line wire 11B, a receive interrupt is generated at the line wire 11A. At the same time, a call ID as a telephone number of the calling person (C) is generated by an exchange system 1. In this case, the arrival of receive interrupt is noticed as a voice signal or a data signal to the transfer destination, and the call ID is noticed as a voice or data signal to the transfer destination (B).
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