noun
auto-answer; automatic answering
Computing term for a system that answers calls, messages, or requests without human intervention.
この電話機には自動応答機能が付いています。
This phone has an auto-answer function.
サポートセンターでは自動応答システムを導入した。
The support center introduced an automatic answering system.
留守番電話 is an answering machine, a physical device or service that records messages, while 自動応答 is the broader concept of automatic answering, often used in computing contexts.
Compound of 自動 (automatic) and 応答 (response, answer).