本文介绍的电路就能实现这个功能，该电路接到原电话机的电话线上使用，不需要人员的操作，能自动的、及时的完成报警和发出警报的动作。-This article describes a circuit can achieve this functionality, the circuit connected to the original use of the telephone line telephone operator does not need staff that can automatically and timely completion of alarm and alert action.