You say you want to be friends, but deep down you always want more.... you will....
The fact she hung up on you, speaks volumes too and then put the other bloke on to answer it the next time also says a lot too.
If you are going to try the whole friends thing (i tried this twice with two exs) give it a few weeks or a month before making contact.
As I said I've tried this twice under two different circumstances and it was just a plain weird feeling... I then determined it was pointless and what friend would do that to another friend ask yourself that... none of mine would.
I know it's hard, but stay clear is my advice...