公共交换电话网 public switched telephone network ; PSTN ; PSTN Public Telephone Switched Network ; Public Switch Telephone Net

公用交换电话网 public switched telephone network ; PSTN ; PSTNPublic Switch Telephone Network ; PSTNPublictch Telephone Network

公众交换电话网 public switched telephone network ; PSTN

交换电话网络 switched telephone network ; PSTN ; Public-Switched Telephone Network

公共交换电话网络 PSTN

通用交换电话网 general switched telephone network

普通交换电话网 GSTN

公用交换电话网络 Public Switched Telephone Network

公用交换电话网络附件 PSIN

公共交换电话网路 public switched telephone network ; PSTN