The Ugandan government and the rebel Lord's Resistance Army are to begin discussing terms for a cease-fire, despite the government's rejection of a rebel demand.
Officials involved in the Ugandan peace talks in southern Sudan say truce discussions are the top item on Tuesday's agenda.
On Monday, rebel representatives called for the dissolution of the Ugandan army. The Ugandan government delegation rejected the demand, saying it was constitutionally impossible to promise.
Salva Kiir, the president of southern Sudan's regional government, has said he expects the warring sides to reach a "peaceful solution" by the end of the negotiating period. He did not mention a date, but Uganda's government has set a September 12 deadline.
Uganda's government has offered amnesty to the rebels if they disarm and renounce all forms of terrorism.
However, the International Criminal Court has not dropped war crimes charges against rebel leader Joseph Kony and four of his top aides.
The Lord's Resistance Army is accused of kidnapping, mutilating and killing thousands of civilans during its 20-year war against the Ugandan government.
Kony and his aides are not attending the talks in southern Sudan, citing fear of arrest.
Some information for this report was provided by AFP and AP.