exchange dial meaning in Chinese

交换拨号

Call 171 will be connected to the disaster message exchange dial service , a nation - wide network
拨打171 ，可以连接到全国设置的用于灾害的留言电话。
In the event of a disaster like an earthquake , many people attempt to make phonecalls at the same time , making it difficult to get through . call 171 to safely confirm places of evacuation among family members , via disaster message exchange dial , even at such a time
地震等灾害发生时，很多人会一起打求助电话，所以电话会难以拨通。而拨打用于灾害的留言电话，即使在电话难以拨通时，也可以询问家人是否平安及联系集合地点。