低信令传送点LSTP ？
令第一部传送门如此富有新意的因素并非是那种将故事和盘托出的方式，而是让玩家“发现故事”的技巧。
What made the first Portal so remarkably innovative was the way it allowed players to discover the story, rather than having it dictated to them directly.
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.
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