Answer: Pandorea pandorana sometimes called Pandora Vine or Wonga-wonga vine has a flower with the coloring you described. It is a warm climate plant originally from Australia, grows and twines to 20 feet and likes plenty of sun. This one flowers for just a few weeks each year.
There is another Pandorea, P. jasminoides also called Bower Vine, which flowers over a longer period of time. The variety "Rosea" might also match your flower description.
Whichever it is, you will definitely need to bring it indoors for the winter, and give it as much sun as possible indoors and outside each summer. You may want to keep it in a good sized container to make the job easier.
Enjoy your vine, they are gorgeous!
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