1. The main attemper telephone is a special purview telephone and have the function of telephone exchange and office telephone. 主调度话机作为一个特殊权限的编程话机，具有话务总机及办公电话的一切功能。
2. Small telephone exchange functional have: direct dial an outside line, you can dial an outside line to machine; 小型电话交换机功能有：直拨外线，提机即可拨外线；
3. DTMF is a reliable and mature technology. Because it can provide the higher dialing speed, it has rapidly replaced the dial pulsing signal which the traditional dial telephone used. DTMF是一种可靠而成熟的通信技术，由于它可以提供更高的拨号速率，迅速取代了传统转盘式电话机使用的拨号脉冲信号。
4. DTMF is a reliable and mature technology. Because it can provide the higher dialing speed, it has rapidly replaced the dial pulsing signal which the traditional dial telephone used. DTMF是一种可靠而成熟的通信技术，由于它可以提供更高的拨号速率，迅速取代了传统转盘式电话机使用的拨号脉冲信号。
5. Push Button Dialing is the use of buttons on a telephone rather than a rotary dial to address a telephone message to a terminal point on the network. 按钮拨号是使用电话上的按钮而不是旋转拨号来将电话信息发送到网络终端节点。
