Door no Mukou de Bell ga Natteta (ドアの向こうでBellが鳴ってた; The Phone Was Ringing on the Other Side of the Door) is the second single by Iida Kaori. It was released on July 28, 2004. This single was released while she was still a member of Morning Musume.
The song "Door no Mukou de Bell ga Natteta" of this single was track #3 on her 3rd album Avenir ~Mirai~.