13-12-2011 20:00 - edited 13-12-2011 20:00
This is Siri's "Raise to Speak" option interfering with Skype's usage of the same feature to detect when you are listening to the earpiece.
Turn off the "Raise to Speak" option in Settings -> General -> Siri, or use speakerphone to listen to the message
I have same issue with Siri- when ever I dial a number in Skype, Siri pop up and I need to cancel my call first while Siri is bubbling- that is annoying. I will stop Siri for some now