The Syrian government and the main opposition umbrella groups say they accept the terms of a deal to cease hostilities from Saturday, the BBC reports.
The government said it would halt “combat operations” in line with the plan announced by the US and Russia.
But the opposition said its acceptance depended on government forces ending sieges and air strikes of civilians.
The deal will not apply to the two main jihadist groups in Syria, Islamic State (IS) and the rival al-Nusra Front.
Al-Nusra is an affiliate of al-Qaeda and forms part of a major rebel alliance.
Under the terms of the agreement announced by the US and Russia on Monday, the Syrian government and opposition were required to indicate by noon on Friday whether they would comply with the cessation of hostilities.