220 ILCS 5/13-218
"Business end user" means (1) an end user engaged primarily or substantially in a paid commercial, professional, or institutional activity; (2) an end user provided telecommunications service in a commercial, professional, or institutional location, or other location serving primarily or substantially as a site of an activity for pay; (3) an end user whose telecommunications service is listed as the principal or only number for a business in any yellow pages directory; (4) an end user whose telecommunications service is used to conduct promotions, solicitations, or market research for which compensation or reimbursement is paid or provided; provided, however, that the use of telecommunications service, without compensation or reimbursement, for a charitable or civic purpose shall not constitute business use of a telecommunications service.
220 ILCS 5/13-218