Call Forwarding On呼叫转接打开;开启来电转接
Call Forward on Busy具有遇忙转接
call provision on bond债券可随时偿还的规定
call down on祈求
call time on终止
Call recording on demand按需录音
Call back on busy回拨繁忙;遇忙回叫
PHRASAL VERB（动词词组） If you call on someone to do something or call upon them to do it, you say publicly that you want them to do it. 呼吁; 公开请求
One of Kenya's leading churchmen has called on the government to resign.
肯尼亚宗教界的一位重要人物已呼吁政府下台。
PHRASAL VERB（动词词组） If you call on someone or call upon someone, you pay them a short visit. 短暂访问
Sofia was intending to call on Miss Kitts.
索菲娅打算去拜访基茨小姐。