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You don't need a call to do it. I was told to hold your nostrils and make a "meee" sort of noise by blowing through your nose then letting go of your nostrils at the end.
He sort of shows it in this...

My guess is Kaikoura/Marlborough area.

I've heard of it, but never tried it. I might give it a go this roar if I get an opportunity. They use it pretty effectively in this video.


https://www.youtube.com/watch?v=PuAsiQvmJL4&t=29s