Difficulty in implementing video conferencing on Internet

I am B.E (C.S.E) Final year student, developing a project on E-Learning.
I have designed some modules like mail,e-library etc.
I was doing video conferencing in LAN.
I have little bit idea of implementing video conferencing on LAN by using Java Media Framework through RTP protocol,
but my teacher suggested me to do that on Internet i.e a student from any location should be able to do video conferencing with the teacher at server.
I don't have any idea how to provide video conferencing on Internet.😕
Please give me some idea about the same.

What steps I should follow?

What will be the H/W & S/W requirements for the project?

P.S:- My teacher clearly said that she cannot guide me in this project....😔