The launch accompanied $725 million of investment by SBC Communications, Intel and Telefonos de Mexico.
Skadden, Arps, Slate, Meagher & Flom advised Williams. Andrew Kenoe and Kenneth Betts from the firm's Chicago office handled tax.
Davis, Polk & Wardwell has been advising Salomon Smith Barney, Lehman Brothers and Merrill Lynch in connection with the deal. Partner Michael Mollerus and associate Darrell Hall dealt with tax matters.