公共交换电话网
public switched telephone networks
PSTN
公共交换电话网路
PSTN
public switched telephone network
公共电话网
PSTN
public switched tele-phone network
公用交换电话网
PSTN
PSTN:PublicSwitchTelephoneNetwork
public switching telephone network
public switched telephone network
公用交换电话网络
public switched telephone networks
PSTN
public switched telephone network
公众交换电话网络
public switched telephone network {= PSTN
public switch telephone network
电话交换网
switched telephone network
telephone switching network
电力调度电话交换网
electric power dispatching exchange network
分封交换电话网络
packet switching telephone network