The central office then sends an SS7 message to a signaling gateway in order to get access to calling and called address information.
然后，为了能访问到呼叫方和被叫方的地址信息，电话局向信令网关发一个SS7消息。
The central office then sends an SS7 message to a signaling gateway in order to get access to calling and called address information.
然后，为了能访问到呼叫方和被叫方的地址信息，电话局向信令网关发一个SS7消息。
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