Tex. Tax Code § 323.208

(a) There are exempted from the taxes imposed under this chapter the sale within the county of telecommunications services unless the application of the exemption is repealed under this section. A county may not repeal the application of this exemption as it applies to interstate long-distance telecommunications services, but if a county has repealed the exemption before the effective date of Part 4, Article 1, H.B. No. 61, Acts of the 70th Legislature, 2nd Called Session, 1987, interstate long-distance telecommunications services in that county are not subject to taxes imposed under this chapter.

(b) The commissioners court of a county by a majority vote may repeal the application of the exemption provided by Subsection (a) for telecommunications services sold within the county.

(c) A county that has repealed the application of the exemption may in the same manner reinstate the exemption.

(d) A vote of the commissioners court repealing the application of or reinstating the exemption must be entered in the minutes of the court. The county judge shall send to the comptroller by United States certified or registered mail a copy of each order adopted under this section. The repeal of the application of the exemption or a reinstated exemption takes effect within the county on the first day of the first calendar quarter after the expiration of the first complete calendar quarter after the date on which the comptroller receives notification of the order.