The Commission adopts two final amendments to the TSR. The first is an amendment making explicit a prohibition in the TSR on telemarketing calls that deliver prerecorded messages without a consumer's express written agreement to receive such calls. This amendment also requires that all prerecorded telemarketing calls provide specified opt-out mechanisms so that consumers can opt out of future calls. The amendment is necessary because the reasonable consumer would consider prerecorded telemarketing messages to be coercive or abusive of such consumer's right to privacy. The second amendment modifies the method for measuring the maximum call abandonment rate prescribed by the TSR's call abandonment safe harbor. The new method will permit sellers and telemarketers to calculate call abandonment rates for a live calling campaign over a thirty-day period, or any part thereof. This amendment is necessary because the current "per day" standard effectively precludes the use of predictive dialers with small calling lists.