The high-level consultation on Darfur which will be held in New York on Friday 21 September must discuss the growing risk of war in south Sudan, says Christian Aid.
The meeting will be chaired by the UN Secretary-General Ban Ki-Moon and the African Union Chairman Alpha Oumar Konare. Other government ministers, including Britain's Minister for Africa, Lord Malloch Brown, are expected to attend.
The talks are scheduled to focus on the upcoming Darfur peace talks in Libya, the deployment of UNAMID - the hybrid UN/AU force - and the humanitarian situation in Darfur.
However, Christian Aid says it is vital that the rapidly deteriorating situation in south Sudan is discussed.
'Without a true commitment from the international community to ensure the Comprehensive Peace Agreement (CPA) is implemented in the south, it is difficult to see how we are going to reach a solution to the conflict in Darfur,' said Judith Melby, Christian Aid’s Africa specialist.
'The rhetoric coming from President Bashir’s National Congress Party and the Sudan People’s Liberation Movement (SPLM) has escalated in recent days and the reported mobilisation of armed forces on the frontier between north and south Sudan is unacceptable,'she added.
The international signatories to the CPA, which includes the UK government, must also ensure that the government of Sudan and the SPLM are held accountable for the agreement they signed up to.
Christian Aid is deeply concerned by the lack of detailed attention to the implementation of the UNAMID force. The logistical implementation of introducing a force of 19,000 into the region is staggering. Rules of engagement and command and control have still not been clarified.
'Unless there is a ceasefire in Darfur which is respected by all sides, the position of the UNAMID force will be highly problematic,' said Ms Melby.
The Libya peace talks are due to open in little more than a month; Christian Aid urges the convenors not to repeat the mistakes of the Abuja peace talks in 2006 which resulted in the now defunct Darfur Peace Agreement (DPA).
Implementation of the DPA was marred by unrealistic deadlines and the absence of civil society and representatives of Darfurians in the talks.