220 ILCS 5/13-705
Every telephone directory distributed after July 1, 1990 to the general public in this State which lists the calling numbers of telephones, of any telephone exchange located in this State, shall also contain a listing, at no additional charge, of any special calling number assigned to any telecommunication device for the deaf in use within the geographic area of coverage for the directory, unless the telephone company is notified by the telecommunication device subscriber that the subscriber does not wish the TDD number to be listed in the directory. Such listing shall include, but is not limited to, residential, commercial and governmental numbers with telecommunication device access and shall include a designation if the device is for print or display communication only or if it also accommodates voice transmission. In addition to the aforementioned requirements each telephone directory so distributed shall also contain a listing of any city and county emergency services and any police telecommunication device for the deaf calling numbers in the coverage area within this State which is included in the directory as well as the listing of the Illinois State Police emergency telecommunication device for the deaf calling number in Springfield. This emergency numbers listing shall be preceded by the words "Emergency Assistance for Deaf Persons" which shall be as legible and printed in the same size as all other emergency subheadings on the page; provided, that the provisions of this Section do not apply to those directories distributed solely for business advertising purposes, commonly known as classified directories.
220 ILCS 5/13-705