An answering machine or service that records telephone messages when no one is home; also refers to the recorded messages. Essentially synonymous with 留守電.
留守番電話に会社からの重要な連絡が入っていた。
There was an important message from the company on the answering machine.
旅行中は留守番電話に切り替えておいた方が安心だ。
It's safer to switch to the answering machine while traveling.
留守番電話のメッセージを聞き終わったら消去してください。
Please delete the answering machine messages after you finish listening to them.