But the Coalition's ability to speak for the broader rebellion has long been in dispute, and fighters inside Syria many of whom reject negotiations with the regime have accused the opposition leaders in exile of being out of touch with reality on the ground. The Coalition's credibility, already strained, took a major hit last month when nearly a dozen prominent rebel groups publicly broke with the opposition umbrella group. More rebel brigades have since followed suit.
The government, meanwhile, has kept its options via Geneva open. Some officials have said all opposition groups should be represented in the talks, while others have refused to deal with the Coalition. Assad, however, has stuck to one point throughout: a refusal to talk with "terrorists," the term the government uses for those trying to topple the president by force.
With questions over who will attend lingering, Elaraby announced after meeting with Brahimi at Arab League headquarters in Cairo that the Geneva conference would be held Nov. 23. Elaraby acknowledged that "many difficulties" remain, but said "it's time that the killings and the bloodshed stopped."
But standing next to him, Brahimi then denied the timing of the proposed peace talks had been finalized. He said he must first visit Qatar and Turkey two key supporters of the rebellion and then meet with U.S. and Russian officials in Geneva before a formal date will be announced.
In a nod to the key issue of who will take part in the talks, Brahimi said the negotiations "will not be held without a credible opposition, representing an important part of opposition within (the) Syrian people."
For the opposition, Elaraby's talk of a Geneva conference in November was premature.
"As Brahimi said, it's not certain, it's not set," said Coalition member Michel Kilo. "The coalition has not decided yet to go to Geneva."
One of the issues that has delayed the talks is Assad's fate.
In the past, the Coalition has said that it will only negotiate if it is agreed from the start that Assad will leave power before the transition period can begin. The government has rejected demands that Assad leave, saying the president will stay at least until the end of his term in mid-2014, and will then decide whether to seek re-election.
While the international community has tried to convene peace talks, the fighting on the ground has shown no sign of abating.
On Sunday, rebels drove a truck laden with more than a ton of explosives into a government checkpoint on the outskirts of the central city of Hama, the state news agency SANA said. A nearby truck carrying gasoline cylinders was caught up in the explosion, prompting a series of other blasts. Footage aired on Syrian television showed rubble, fires, and bodies on the ground.
The British-based Syrian Observatory for Human Rights said the al-Qaida-linked Jabhat al-Nusra carried out the attack. SANA put the death toll at 37, while the Observatory placed it at 43.
It was the second deadly assault on a government post in two days. On Saturday, rebels led by fighters from Jabhat al-Nusra set off a car bomb while assaulting a checkpoint near Damascus, killing 16 soldiers.
The high-profile role played by Jabhat al-Nusra and other al-Qaida-linked militants, who have become some of the most powerful rebel factions and do not acknowledge the Western-backed Coalition, underscores the challenges of negotiating an end to the fighting.
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Associated Press writers Diaa Hadid in Beirut, Albert Aji in Damascus and Charlie Gans in New York contributed to this report.
