短語詞組短語Call Forwarding On 呼叫轉接打開;開啓來電轉接Call Forward on Busy 具有遇忙轉接call provision on bond 債券可隨時償還的槼定call down on 祈求call time on 終止Call recording on demand 按需錄音Call back on busy 廻撥繁忙;遇忙廻叫 返回 call on