83 Ill. Adm. Code 772.90
Blocking
Section 772
Section 772.90 Blocking
a) A local exchange carrier shall provide blocking, where
technically feasible, at no charge for each type of dialing arrangement
permitted by Section 772.50(a) on a one-time basis to all telephone
subscribers.
b) The local exchange carrier may charge a non-recurring fee for
each subsequent request for blocking or unblocking pay-per-call service. These
charges shall be filed with the Illinois Commerce Commission pursuant to
Section 9-201 of the Public Utilities Act [220 ILCS 5/9-201].
c) A subscriber who transfers service to a new location and is
served by the same local exchange carrier shall be able to maintain blocking of
pay-per-call service without any additional charge to establish blocking at the
new location.
d) Requests by subscribers to remove pay-per-call blocking must
be in writing to the local exchange carrier.