The generals and protest leaders had been expected to come to an agreement on Wednesday on the make-up of a ruling council.
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The British ambassador to Khartoum said Sudanese security forces had fired at protesters.
The composition of the new sovereign council has been the toughest part of the negotiations.
The army generals and protesters are at loggerheads over who will sit on a new ruling body that would replace the existing military council.
The latest planned round of talks come as thousands of protesters remain camped outside army headquarters in central Khartoum.
Military council is delaying the entire transfer of power -protest leaders
Protest leaders and army chiefs each maintain their camps should hold a majority in any new council.
On Thursday, protest leaders presented the council with a proposal for the new civilian structures they expect to govern the country.
The creation of a joint civilian-military council would be an overall ruling body -protest leaders
The military council invites the leaders of the Alliance for Freedom and Change to a meeting at the presidential palace this evening