Japanese by Example
Learning through examples in manga

Answering machine functionality with 機能

名探偵コナン » Volume 6 » Page 64

A murder suspect explains how when he called the victim, the phone kept ringing until the answering machine picked up.

目暮(めぐれ):
(おく)さん!ここの留守番(るすばん)電話(でんわ)機能(きのう)は?」
“Ma'am! How does this answering machine function?”
(おく)さん:
「は、はい… 十数回(じゅうすうかい)コールしても()ない(とき)は、自動的(じどうてき)留守番(るすばん)電話(でんわ)()()わるようになってます…」
“Well... When there's no answer after ten rings, it automatically switches to the answering machine...”

機能(きのう) refers to the mechanical function of the answering machine.