Need help identifying a climbing vine?

Climbing Vine : I have a vine that covers a wall down one side of my house. It has waxy oval leaves that alternate down each stem. Older parts of the plant have woody stems. Newer branches in thick parts actually stick out away from the plant and the parts up high can actually create some very nice shade. It has a milky white sticky sap and it grows odd purple and green pods that are filled with the same gluey sap.