telephone solicitation
(4) The term “telephone solicitation” means the initiation of a telephone call or message for the purpose of encouraging the purchase or rental of, or investment in, property, goods, or services, which is transmitted to any person, but such term does not include a call or message (A) to any person with that person’s prior express invitation or permission, (B) to any person with whom the caller has an established business relationship, or (C) by a tax exempt nonprofit organization.