Which Brown Tree Frog ?

This little frog (about 40mm long) has been seen, and is currently calling, in the Strath Creek area.  But is it the Southern Brown Tree Frog (Litoria ewingi) or the Plains Brown Tree Frog (Litoria paraewingi) ?  The Flowerdale/Strath Creek area seems to be roughly on the junction of the distributions of the two species, which do not overlap.  Can anyone help us identify exactly which species it is ?

The pads on the ends of its digits, which identify it as a Tree Frog, are clearly visible in this photograph.

The recording below (assumed to be of the photographed species) was made on a very frosty early morning, so it may well have been feeling a bit sluggish!