"We've been very, very clear throughout the process that there are certain things we can agree to and certain things we can't agree to," Gross told reporters at U.N. offices in Geneva. "It's not a negotiating issue. This is a matter of national policy."

He said the United States was "deeply disappointed" with the European Union's proposal Wednesday advocating a "new cooperation model," which would involve governments in questions of naming, numbering and addressing on the Internet.