i haven't checkd into this, but we got a solicitation at our business from a telemarketing company not based in the usa. they were trying to get us to sign up for their service.
their brochure stated that they didn't have to follow the do not call guidlines, since they are not governed by the usa.
this could be why calls that are not a non profit are still getting through.
btw...we didn't sign up. we don't make cold calls or phone solicate.