"The stronger and more unified your message, the better chance we have of shifting the dynamics of the conflict," Annan was quoted as telling the 15-nation UN Security Council.
Special envoy Kofi Annan said on Friday he was disappointed by President Bashar al-Assad's response to ideas for ending the bloodshed in Syria, and appealed to the UN to unite in its bid to halt the conflict.
"The stronger and more unified your message, the better chance we have of shifting the dynamics of the conflict," Annan was quoted as telling the 15-nation UN Security Council.
He also told the council he was sending a mission to Damascus next week to discuss putting monitors in place even though he has had a "disappointing response" so far to his proposals from Assad, diplomats said.
The United Nations says some 8,000 people have died since opposition protests flared last March, but dissent monitors say the toll is closer to 9,100 lives.
Speaking by video conference from Geneva, Annan briefed a closed-door meeting of the council about his talks with Assad in Damascus last weekend.
The former UN secretary general said his "six point proposals" to Assad remain on the table, but that he had "no illusions" over the scale of his mission as the uprising enters its second year.
Annan's spokesman, Ahmad Fawzi, speaking in Geneva, confirmed the plans for a mission to the Syrian capital.
"Mr Annan has decided to send a mission to Damascus to discuss modalities of a monitoring mechanism and practical steps to implement other issues in Mr Annan's proposals, including an immediate cessation of the violence and the killing," Fawzi said.
On the ground, thousands of anti-regime protesters today called for foreign military intervention to bring down the Syrian government. And the Syrian Observatory said at least 15 people were killed around the country today.
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