Tenn. Code Ann. § 9-19-107

In the event fully registered public obligations are subject to redemption by the terms thereof, the issuer may redeem one (1) or more of such obligations or portions thereof by giving the notice specified by the official actions authorizing such obligations or, in the event no provision for notice is therein specified, by mailing or directing the registration agent to mail, postage prepaid, not less than twenty-one (21) days prior to the date fixed for redemption, to the registered owners of such obligations which are to be redeemed at their last address appearing upon the registration books, a notice that the issuer is calling for redemption prior to maturity of such obligations in accordance with the terms thereof. Such notice shall specify the number, issue, date, date fixed for redemption, the date interest will cease to accrue, the redemption price and such further information with respect to such obligations as may be required by the terms thereof. Such notice may be waived by the registered owner of the public obligation subject to redemption.