
The Philippines, as chair of the Asean Summit, will be present at the meeting on the island of Cebu, Thai premier Anutin Charnvirakul told reporters.
Thailand has historically refused to take part in Cambodian efforts to settle border disputes using international mechanisms, including the International Court of Justice, insisting those be negotiated bilaterally.
A ceasefire has been in place between Thailand and Cambodia since late December after two eruptions of fighting along large stretches of their 817km border, the first of which ended after intervention by US President Donald Trump.
Each side blames the other for triggering both rounds of clashes, which killed close to 150 people and displaced hundreds of thousands of people.