公共交换电话网
public switched telephone networks
PSTN
公共交换电话网路
public switched telephone network
PSTN
公共电话网
public switched tele-phone network
PSTN
公用交换电话网
public switching telephone network
public switched telephone network
PSTN
PSTN:PublicSwitchTelephoneNetwork
公用交换电话网络
public switched telephone networks
public switched telephone network
PSTN
公众交换电话网络
public switched telephone network {= PSTN
public switch telephone network
电话交换网
telephone switching network
switched telephone 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