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Epiphyllum sp.
Please check these links.Galán de Noche
http://blogdejardineria.com/galan-de-noc...
http://tinhhoa.net/5-loai-hoa-dep-va-quy...
I cannot read the language but the image looks similar.
However, this is NOT Cestrum nocturnum which we call Raat ki Rani (Queen of the night) in India. Those flowers are insignificant not large and showy like the spotting.
It is likely to be Epiphyllum oxypetalum
http://www.flowersofindia.net/catalog/sl...