VoIP Project

I am a final year student of Bachelor of Technology(Computer Science and Engineering), from India wishing to do a final year project, as part of our curriculum, on VoIP, since it is one of the most recent topics. I would like to develop a VoIP software that would help communication between two computers and from a computer to a phone. I am reasonably good at programming in Java and thus,would like to develop it in Java. I would like to know the view of your experts on my decision to do so and give your opinion as to whether it is good enough as a final year project or too difficult to complete within a year.If possible, I would be extremely glad if you could recommend me of the resources available on the internet.