Who called in the alarm and which alarm did Beatty finally answer?

In Ray Bradbury's "Fahrenheit 451," it is revealed that Montag, the protagonist, called in the alarm after he became disillusioned with the society's censorship and book burning. The alarm that Captain Beatty finally answers is a call to Montag's own house, where Montag's rebellion against the oppressive regime becomes evident. This moment marks a significant turning point in the story, highlighting the conflict between individual thought and societal control.