The President of Kazakhstan Nursultan Nazarbayev delivered a speech in the general session of the event, IRNA said.
Nazarbayev pointed to participants' valuable efforts, expressing hope for Astana talks to pave the way for peace and to present political solution for Syria crisis.
According to the agenda, heads of Iranian, Syrian and Turkish delegations are to expound on three countries' stances and convergence to find a political solution.
The 2-day negotiations is being held behind the closed doors, but some non-confidential parts will be displayed for reporters through video conference.
On the sidelines of the event, Syrian delegation headed by Syria permanent ambassador to UN Bashar Jafari and in partnership with UN Special Envoy for Syria Staffan de Mistura is scheduled to hold talks with Syrian armed opposition groups.
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