With respect to each pay-per-call service, the call shall contain an introductory disclosure message that specifies clearly, and at the same audio volume of the ensuing program, if the charge for the call is on a flat rate basis, the total charge for the call, or if charged on a per-minute basis, the charge per minute for the call, the charge for each additional minute, and the amount of time necessary to complete the call, and all other fees, and which informs the caller of the option to disconnect the call at the end of the introductory message without incurring a charge. However, an introductory message is not required if the total charge for the call is one dollar or less.