短語(yǔ)詞組短語(yǔ)signaling g line circuit 信號(hào)線電路signaling g line 信號(hào)線signaling line circuit 信號(hào)線電路Line Signaling 線路信令LSE Line Signaling Equipment 線路信令設(shè)備analog line signaling 模擬用戶信令line signaling unit 線路信令單元Subscriber line signaling 用戶線信令line signaling system 線路信令系統(tǒng) 返回 signal line