Foreign Minister Winston Peters has made a farewell call to Australia's outgoing Foreign Minister Julie Bishop, and is seeking a discussion with her successor ahead of next week's Pacific Islands Forum.

"I gave her a call to thank her for the co-operation and assistance with respect to the Pacific and elsewhere where we have been in serious consultation with them as to what we can do better and to wish her all the best," said Peters. "And to reflect what a rugged, dirty business politics is."

Bishop was Foreign Minister for five years and Liberal deputy leader for 11 years in Opposition and in Government.

Peters said she was on the same wavelength as New Zealand when it came to the Pacific reset – a renewed focus and funding boost for New Zealand's engagement with the Pacific.

Peters was in Canberra last Wednesday, between the two Liberal leadership votes, on Tuesday when Peter Dutton unsuccessfully challenged Malcolm Turnbull, and on Friday when a second ballot was forced. He then visited Vanuatu.

Bishop was one of three contenders for Liberal leadership, after Turnbull was forced to step down, but was the lowest polling despite being the public favourite.

She resigned from cabinet on Sunday to sit on the back bench and new Prime Minister Scott Morrison, on Bishop's advice, has replaced her with former Defence Minister Marise Payne. There is speculation she could become Australia's next Governor-General.

In other portfolios with a frequent interface with New Zealand, former Trade Minister Steve Ciobo resigned his post in support of the Dutton challenge and the new Trade Minister is Simon Birmingham, the former Education Minister. Christopher Pyne is the new Defence Minister.

Peters has not yet spoken to Marise Payne but he has asked her to call him when she can find the time and that was likely before next week's Pacific Islands Forum in Nauru.

Morrison has decided not to attend the forum and Payne will be representing Australia.

Morrison's first overseas visit will be to Indonesia, to put the seal on a new free trade deal.

Peters said his visit to Vanuatu allowed him to meet local politicians who were concerned about the fact there was almost always a leadership spill in the year before an election.

"They shared with me their concern about the external forces, so to speak, that are involved in those attempted spills in Vanuatu. It's a known fact."

"It is sadly interference. It is not elements that are respecting Vanuatuan people's right to make these decisions."

He would not say who constituted the external influence.

"They understand acutely that if they are to be successful they have got to stabilise their politics and not have a governmental change in between elections, which is just too common in some parts of the Pacific."

The irony of what had happened in Australia was not lost on the Vanuatu politicians, he said.

National foreign affairs and trade spokesman Todd McClay said it was positive that Morrison's first trip, to Indonesia, was about trade, but he hoped Morrison's second trip would be to New Zealand.

McClay said Ciobo had been a good friend to New Zealand in trade and they had worked closely on the Pacific Alliance and on TPP after the United States withdrew.

"But ultimately there is institutional knowledge on both sides. Trade ministers may come and go but the free trade train needs to continue and I have faith that the Scott Morrison Government will continue to recognise we can do more together on the world stage than apart."

It would be important for Trade Minister David Parker to meet Birmingham quickly and work out the ways to work together.

There was a big challenge looming about the World Trade organisations dispute settlement system.

"It is friends of America like Australia and New Zealand that need to be talking to them directly to make sure the WTO is not irreversibly harmed."