The chairman of the African Union is due to arrive in
John Kufuor, also
Opposition head Raila Odinga had said he would only talk with President Kibaki if Mr Kufuor mediated.
Violent clashes since the 27 December election have left 600 people dead.
The BBC's Will Ross in
Our correspondent says Mr Kufuor is not someone to bash heads together - he is known as the "gentle giant" and has helped negotiate during the conflicts in
South African Nobel peace prize laureate, Archbishop Desmond Tutu, and the top
Mr Odinga has said he was cheated of election victory and has called on Mr Kibaki to stand down.
But the opposition leader did call off planned nationwide rallies, saying he wanted to give international mediation a chance.
Ms Frazer said there may have been vote-rigging by both sides and that ordinary Kenyans had been let down.
"They've been cheated by their political leadership and their institutions," she said.
Some 250,000 people have fled their homes in clashes between rival political supporters, ethnic groups and the police.
Mr Odinga said
Meanwhile, Mr Kibaki has reconvened parliament for 15 January.
Both sides have accused the other of ethnic cleansing during a week of violence after Mr Kibaki was declared the winner.
A government ministry says 486 people have been killed but a senior police officers told the AFP news agency: "We have at least 600 dead... some bodies are still in the bushes where fighting occurred."