automatic digital message switching center
自动数字电文交换中心
自动数字讯息交换中心
自动数字报文转换中心
telephone management network
telephone intelligentized network system
Telephone Exchange Network
switched telephone network
Stored program-control telephone switching system
Stored program control telephone switching systems
special telephone network
rural telephone network
radio telephone network
Public Telephone Network
public switching telephone network
public switched telephone network {= PSTN}
public switched telephone network
公用交换电话网
公共交换电话网路
公用电话网
公共电话交换网
固定电话网络
公用交换电话网络
电话公网
电话网
公用电话网络
Public Switch Telephone Network
PSTN Public switched telephone network
private telephone switching