Did you leave a message when you called? I would have left a brief 30 second message telling her who it was and if she doesn't call you back after leaving a message it's a guarantee she ain't interested.
I just say in the voice mail hey it's me bla bla bla what's up? My # is bla bla bla hit me up.
If she replies then fine if not I don't really care i have a life to live and other women to game. I'll be deleting that # in a week if I don't hear back from her
THEN ill be the one saying "who is this" if she texts me back
HOWEVER, any time longer then that I might not even reply unless of course they are super hot. You have to remember if she takes longer than a week to reply to you it's not because she is busy that right there is DISRESPECT.