A Mystery Orchid, Any Answers Please?

My friend has this most beautiful fragrant orchid. Most years it flowers abundantly and has a wonderful scent that fills the house when the suns warms it. It lives very happily in the conservatory, has densely packed stems and is about two feet wide and nearly as tall! It was given to her by a South African woman many  years ago. I know there are some orchid experts following me, can any of you name it?