also: キャッチフォン
noun
Wasei-eigo from 'catch phone'; refers to the telephone service that notifies you of an incoming call while you are already on a call.
wasei-eigo (Japanese-coined English), from catch phone
通話中にキャッチホンが鳴った。
Call waiting beeped while I was on the phone.
キャッチホン機能をオンにする。
Turn on the call waiting feature.