English translation for "数字电话交换业务"

digital telephone switching service

Similar Words：

"数字电话" English translation, "数字电话电路业务" English translation, "数字电话机" English translation, "数字电话交换机" English translation, "数字电话交换局" English translation, "数字电话设备" English translation, "数字电话网" English translation, "数字电话网络" English translation, "数字电话系统" English translation, "数字电话学" English translation