About 11 percent of broadband households have intercoms, including 8 percent that have intercoms at entry doors and 7 percent that have intercom stations inside the home, according to May 2013 research by Parks Associates, Dallas. The survey reflects responses from among the three-fourths of U.S. households equipped with broadband, or about 93 million households. The May survey did not specify if intercoms were IP-based.

From the article, "A Sound Opportunity: Residential Intercoms & Audio Systems bounce Back Along With Construction." 

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