UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number: 001-13364 -------------------------------- Telmex Corp S.A. (formerly Chilesat Corp S.A.) - ------------------------------------------------------------------------------- (Exact name of registrant as specified in its charter) Riconada El Salto No. 202 Comuna de Huechuraba, Santiago, Chile Telephone: (011-562-582-5786) - ------------------------------------------------------------------------------- (Address, including zip code, and telephone number, including area code, of registrant's principal executive offices) Common Stock of Registrant represented by American Depositary Shares each representing 10 shares of Common Stock - ------------------------------------------------------------------------------- (Title of each class of securities covered by this Form) None - ------------------------------------------------------------------------------- (Titles of all other classes of securities for which a duty to file reports under section 13(a) or 15(d) remains) Please place an X in the box(es) to designate the appropriate rule provision(s)relied upon to terminate or suspend the duty to file reports: Rule 12g-4(a)(1)(i) [ ] Rule 12h-3(b)(1)(i) [ ] Rule 12g-4(a)(1)(ii) [ ] Rule 12h-3(b)(1)(ii) [ ] Rule 12g-4(a)(2)(i) [x] Rule 12h-3(b)(2)(i) [x] Rule 12g-4(a)(2)(ii) [ ] Rule 12h-3(b)(2)(ii) [ ] Rule 15d-6 [ ] Approximate number of holders of record as of the certification or notice date: Less than 300 ----------------------------- Pursuant to the requirements of the Securities Exchange Act of 1934 Telmex Corp S.A. has caused this certification/notice to be signed on its behalf by the undersigned duly authorized person. /s/ Fernando Escrich Juleff Date: April 15, 2005 By:--------------------------------- Name: Fernando Escrich Juleff Title: Chief Financial Officer