反向發(fā)信號(hào)路徑 backward path: 反向通路; 回程通路signaling path: 信號(hào)通路backward supervision path: 回程信號(hào)通路forward signaling path: 正向傳信通路; 正向信號(hào)通路return signaling path: 返回信令通道下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯