A signal switch may also send a query message to the signal control point,which acts as a centralized database for routing instructions,such as how to handle 800/888 calls.是什么意思_A signal switch may also send a query message to the signal control point,which acts as a centralized database for routing instructions,such as how to handle 800/888 calls.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句