Conn. Gen. Stat. § 7-377: Redemption of bonds before maturity.

Any city or borough, by vote of its legislative body, or any town or other municipality which is authorized to levy and collect taxes, by vote, at a meeting warned and held for that purpose, may authorize the treasurer or other custodian of its sinking fund to redeem any of its bonds, as opportunity may permit, before their maturity; and no money in any sinking fund shall be used to redeem any bonds before maturity other than those for the redemption of which such fund was created.