38.5.3412 CALL BLOCKING PROHIBITED
(1) Except as otherwise provided in these rules, all agreements or contracts between an operator service provider and an owner of a pay telephone instrument or private telecommunications system must contain a provision which prohibits call blocking as defined in these rules. This requirement applies to all contracts or agreements entered into after the effective date of this rule; however, all operator service providers must comply with (2) of this rule at all times, including during the remaining term of all existing contracts and agreements.
(2) Operator service providers are prohibited from requiring or providing call blocking at any telephone instrument. Operator service providers are prohibited from offering service at any telephone instrument where call blocking exists.
(3) This rule does not prohibit the blocking of 101xxxx-1+ or 101xxxx-011+ calls.