Kofi Annan, the UN and Arab League envoy on Syria, said on Tuesday that there should be no pre-conditions to stopping the violence.
He said an end to the bloodshed could be achieved by April 12th.
A deadline for Syrian troops to leave protest hubs expired earlier on Tuesday.
Annan was speaking in Hatay, southern Turkey, where he was visiting refugee camps.
He stressed the welfare of the Syrian people must be put first.
“This has gone on for too long and it’s time for the violence to stop. It’s time that we stop the guns, it’s time that the military went back to their barracks,” Annan told reporters.
Annan’s six-point plan to end the year-long Syrian crisis calls for:
1) Syrian troops to leave population centres
2) All parties to end violence by 5:00 CET on Thursday
3) Political dialogue between the government and its opponents
4) The release of those people detained arbitrarily or jailed for peaceful political activities
5) The right to protest
6) Increased freedoms for the media to report