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President Barack Obama and Iranian President Hassan Rouhani spoke by phone on Friday, the highest-level contact between the two countries since the Iranian Revolution in 1979 and a sign that both sides are serious about reaching a pact on Iran's nuclear program.

Obama had hoped to meet with Rouhani earlier this week while both men were in New York for the United Nations General Assembly, but Iran decided a meeting would be too complicated.

"I reiterated to President Rouhani what I said in New York. While there will surely be important obstacles to moving forward and success is by no means guaranteed, I believe we can reach a comprehensive solution," Obama said at the White House.

Obama said both men had directed their teams to work expeditiously toward an agreement on the nuclear issue.

Rouhani said on a Twitter feed believed to be genuine that in his phone conversation he told Obama "Have a Nice Day!" and Obama responded