This number is from the American Lung [***]'n and as a charity, they are exempt from the Do Not Call list. It is probably dialed by a computer and then turned over to someone in a boiler room. If it doesn't get turned over to a worker quickly enough, it will appear there is no one there.
That telephone number, from "ALA", is from the American Lung Association. It is a charity and therefore exempt from the Do Not Call list. They usually call and ask you to solicit donations from about 15 of your neighbors. You can go to charitynavigator.org, a rating system for charities, and look up their track record on how well they handle their donations and how transparent they are about that, also what they pay their top officials. There are several branches, so you can look up the one for your region. Charity Navigator is worth bookmarking for future reference because it is an excellent way to check on charities; there are a lot of "sound-alike" charities out there that are not the major ones you tend to believe they are.
Please file a complaint with donotcall.gov. With enough complaints, they will pay attention and put their efforts into stopping and punishing these companies.
This number is from the American Lung [***]'n and as a charity, they are exempt from the Do Not Call list. It is probably dialed by a computer and then turned over to someone in a boiler room. If it doesn't get turned over to a worker quickly enough, it will appear there is no one there.