I have to admit getting stung by Teleadapt with their RJ11 adaptors, what I paid £9 for in the UK was £1 in Pantip Plaza.
Same brand etc.
Electric adaptor plugs from WONPRO, the same deal.
see
http://www.wonpro.com/
I agree with comments about Oz phone plugs, they must be the weirdest on the planet.
I wonder why.