Crackling sound on Skype 2.1

[amirmku]

Hi guys,
I have recently installed ubuntu 9.04. system sound works fine. But I am facing problem with skype 2.1. In general During the test call I am able to listen to ringing sound but unable to my own voice which gives nothing except a noisy crackling sound.
I have set my volume prefernces as capture conexnat pulse but whenever I start skype the connection between the two speakers will break and volume will come to zero leaving behind nothing except noisy crackling sound.

can someone help.

Please find the screen shot attached