There was only a short ring which stopped before I could answer it. A second call (different number) came through within seconds and was identified as Bupa Dental, ringing to confirm an appointment.
Seeing that (08) 8326 8349 has been identified by another commenter as Bupa Dental, I would safely think it is an authentic call from Bupa Dental.

I called back number (08) 8326 8349 spoke to a woman who said company name is Bupa Dental.