A draft UN resolution has outlined plans to send an advance mission of 20 to 30 unarmed observers to Syria monitor compliance with a new peace plan, possibly by early next week.
The draft was prepared by the US and is expected to be voted on at the Security Council today.
The observers would monitor the ceasefire and check the Syrian army was withdrawing from population centres in accordance with the peace plan.
Syria says it will accept UN monitors.
Security Council ambassadors - including Russia and China, who have vetoed previous resolutions - have all backed the idea of observers.
Meanwhile, US Secretary of State Hillary Clinton said the ceasefire was important but was just a first step.