Those differences have threatened to delay the start of the negotiations.
The State Department said the two men had discussed plans for the negotiations that the UN special envoy for Syria, Staffan de Mistura, hopes to convene in Geneva on January 25 and "the importance of maintaining progress toward a diplomatic solution to the crisis."
But, while both sides said they did not support a delay in the talks, it was not immediately clear if the differences had been resolved.
"The political process will begin, we hope, in the nearest future, during January," he said.
"Various dates have been named, but the final decision will be taken by the Secretary-General of the United Nations on the advice and recommendations of his special envoy Staffan de Mistura."
Lavrov added that the main topic of conversation with Kerry was "coordination," primarily about terrorist organization, which would be left out of the political process as well as a ceasefire that is envisioned to take effect once the negotiations begin.
The negotiations between the Assad government and the opposition are to be the first step in a proposed 18-month political transition for Syria, which has been mired in civil war for four years.
Differences over which Syrian opposition groups should be labeled terrorists and barred from the negotiations and the ceasefire have led to concerns that the talks may have to be postponed.
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