The Leaders of Sudan and South Sudan meet to try and reach a deal to end hostilities and restart oil exports.
The Sudanese delegation spokesman said differences still existed after talks.
(SOUNDBITE) (English) SPOKESPERSON FOR THE SUDANESE DELEGATION BADER EL-DIN ABDULLAH SAYING:
"Most of the economic issues are agreed about and there are some difficulties here and there in that economic clusters, but the main hiccup now is regarding the security issues."
Diplomats have been trying to mediate between the rivals, which have a history of signing and then not implementing deals.
Both badly need the oil revenues at stake.
In April, the two armies fought for weeks along the unmarked and disputed border after a row escalated over how much South Sudan should pay to use northern oil pipelines.
The two reached an interim deal in August to restart oil exports.
But Sudan insists on first reaching a security accord.
South Sudan has said it expects Sudan's President Omar Hassan al-Bashir and his southern counterpart, Salva Kiir to reach a deal by Monday.
If they fail they risk incurring U.N. Security Council sanctions.
