A spokesman for AT&T declined to comment.

Federal regulators are poring through more than 7.5 million pages of documents, hundreds of white papers and testimony by company executives to evaluate whether the AT&T-DirecTV deal will harm competition or serve the public interest. AT&T and DirecTV have both said they are confident the deal will close by the end of June.

“We feel very, very strongly that there are both significant consumer and competitive benefits to our transaction,” Michael D. White, chief executive of DirecTV, said on Tuesday in an earnings call.

He added that the companies were expected to begin discussions with regulators in the next several weeks over conditions that could be placed on the deal.

The Justice Department and the F.C.C. declined to comment.

Antitrust experts and industry executives said that, unlike the Comcast deal, they did not expect regulators to raise significant concerns about the AT&T transaction.

That is primarily because the deal does not include two of the major issues in the Comcast-Time Warner Cable proposal. First, a combined AT&T-DirecTV would not control a majority of the country’s high-speed broadband customers. Second, neither of the companies owns an entertainment group, as Comcast does with NBCUniversal.

In addition, while a combined AT&T-DirecTV might eliminate one option for television service in some regions, it could use its heft to create a stronger competitor in the pay television market. AT&T has also promised to expand broadband service to more rural areas.

“This is not going to be Comcast-Time Warner Cable Round 2,” said Amanda L. Wait, a former Federal Trade Commission lawyer who now is a partner at Hunton & Williams. “It was actually pretty smart of them to time the deal the way they did. If AT&T-DirecTV would have been announced first, people would have been more upset about it. But with the Comcast deal, it didn’t look as bad.”