noun
built-in greeting; default response message
Computing term for a pre-recorded or system-generated greeting, such as an automated voicemail message or a default chat response.
留守番電話の標準の応答メッセージを設定する。
Set up the default greeting message for the answering machine.
Compound of 標準 (standard) + の (possessive particle) + 応答 (response) + メッセージ (message). A straightforward technical term.