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阐述了利用现有的通信网络—电话交换网络，采用双音多频（ＤＴＭＦ）方式传送信息的电话报警系统硬件结构和软件设计，并对报警装置（发端）、监控装置台（收端）功能及设计思想作了详细介绍．该系统采用单片机控制，功能强、报警速度快、通讯距离不受限制．特点是多功能、实用性强、电话号码和信息码可任意设置．迁移灵活、安装方便．
The hardware structure and software design of the telephone alarm system which uses the existing communication network - telephone exchange network and uses DTMF to transmit information are described. The functions of alarm device (originator), monitoring device station (receiver) And design ideas were introduced in detail. The system uses SCM control, strong function, alarm speed, communication distance is not limited. Features are versatile, practical, telephone number and information code can be arbitrarily set. Migration flexibility, easy installation.