It has long been recognized that the police power of a state extends beyond the health, morals, and safety of the community, and encompasses the duty to protect the privacy of its citizens, including the authority to protect the peaceful enjoyment of the home and the well-being and tranquility of the community.

So reads a 2006 Indiana Supreme Court opinion relating to automated calls. 

[T]he United States Court of Appeals for the Eighth Circuit, in a case upholding the constitutionality of the North Dakota Telephone Solicitations Act, N.D.C.C. ch. 51-28, the statute involved here, noted that “residential privacy is a ‘significant’ government interest, particularly when telemarketing calls ‘are flourishing, and becoming a reoccurring nuisance by virtue of their quantity.'”