How can i develop web phone application

Question

Development Language : Asp.Net MVC or Java
Sip Server : Asterisk
Java SDK : MjSip

I want to develop applications Web Phone. How do I do this with Java Or how can I make using Asp.net?

Do I need to use Node JS ? How should I go about it

http://tryit.jssip.net

What I have tried:

WebRTC, JsSip. ( http://tryit.jssip.net )