If you need VoIP application that is portable, can be bring anywhere, I suggest you to use this Skype 5 beta portable edition for Windows. This is unofficial portable edition of Skype. You can download this Skype portable from the link provided below this post.
I have a scenario in which i am recording audio in background. Now when Skype call comes i want to release the hold of mic and let Skype do its job. To get the Skype event i am using AudioManager.MODE_IN_COMMUNICATION event. But this event doesn't seem to be working and releasing mic because of which two parties on Skype can't speak to each other.
Skype has launched a new version of its iPhone application that, for the first time, allows iPhone users to make and receive calls over their 3G data connection, but it will start charging for Skype-to Skype-calls.