But observers say it is unclear how much the one-day meeting, which is not being attended at a minister level, can achieve on an issue that has dogged the region for years but gone largely ignored by authorities.
Earlier this month Bangkok began a belated crackdown on the smuggling trade in the country's deep south, throwing the multi-million dollar industry into disarray as gangmasters abandoned their victims on land and at sea.
The vast majority of migrants are Rohingya Muslims fleeing persecution in Buddhist majority Myanmar or Bangladeshis trying to escape grinding poverty.
The meeting -- which Thailand says must tackle the "root causes" of the current exodus -- is an attempt to forge some kind of united front against the trade in a region where countries shy away from direct diplomatic confrontation -- something rights groups and observers say has allowed people smuggling to thrive unchecked.
Earlier this week UN human rights chief Zeid Ra'ad Al Hussein said the meeting should get "to grips with the need for far stronger arrangements for the protection of both migrants and asylum seekers".
Countries attending include those directly affected the current crisis such as Thailand, Malaysia, Indonesia.
They face restrictions on movement, jobs and family size while the government refuses to recognise them as citizens, instead calling them illegal "Bengalis" from Bangladesh.
But the former junta-led nation has balked at any criticism of its treatment of the community and has previously threatened to pull out of the talks altogether if the word Rohingya is used.
Other countries attending have a less obvious direct link to the Southeast Asian migrant crisis such as Afghanistan, India, Iran and Papua New Guinea.
