SS7则使用带外信令，即在另外的一个物理信道上传送信令消息。

SS7 USES out-of-band signaling where signaling messages are carried on a separate physical channel.

youdao

你需要知道你的信令是在“带内”还是“带外”。

You need to know if your signaling is "inband" or "out of band. "

youdao

你需要知道你的信令是在“带内”还是“带外”。

You need to know if your signaling is "inband" or "out of band. "

youdao