Dear friends,We are planning to build an online tutoring web application. We need to develop audio function (VoIP, I guess?), white board, screen sharing functions in this web application. I am new to this tech area. Any one can give some info on:(1)...

Dear friends,We are planning to build an online tutoring web application. We need to develop audio function (VoIP, I guess?), white board, screen sharing functions in this web application. We want to know:(1) What is the approach to implement these f...