The Opposition is demanding Sri Lankan asylum seekers be immediately deported without having refugee claims assessed after another boat arrived at the Cocos Islands.
But the Federal Government said the coalition was hypocritical because Sri Lanka had not signed the United Nations Refugee Convention - the reason Opposition Leader Tony Abbott gave for blocking Labor's Malaysia solution.
The Customs vessel Hervey Bay stopped the boat with 81 people on board on Saturday. Since June 1, 24 boats with 1079 people have reached the Cocos Islands, which are about halfway between Sri Lanka and WA.
Shadow foreign minister Julie Bishop and immigration spokesman Scott Morrison said the Government should open talks with Sri Lanka on dealing with the influx.
Their statement said Sri Lanka was making an effort to stop boats leaving and arrangements should be made to send those who made it to Australia straight back.
They said the rejection rate for Sri Lankan asylum seekers was high, most were economic migrants and a bigger proportion had negative ASIO security assessments.
But Immigration Minister Chris Bowen said the move would breach Australia's obligations under the UN Refugee Convention.
He said the Opposition claimed the convention was essential for the Malaysia solution but should be disregarded to turn boats back to Indonesia and deport Sri Lankans.
The latest Government measure to stop boats is to warn asylum seekers trying to reach Australia that they could be sent to Nauru or Manus Island, where they will not be processed faster than in refugee camps.
The "Australia by boat? No advantage" campaign starts tomorrow through YouTube, DVDs and brochures and is aimed at immigrant communities both here and overseas.
The videos in English, Farsi, Pashto, Arabic, Tamil, Sinhalese and Dari show derelict housing in camps that have been unused for years.
They say: "There is no advantage in paying a people smuggler to travel to Australia."
Last night, another boat carrying 48 asylum seekers was intercepted north-west of Ashmore Islands.
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