In this video I will show you how to make a fully featured WebRTC, Browser Based, SIP Phone. Once again we will use the Raspberry Pi, and install Asterisk 13 (from Source), setup and configure Asterisk for web sockets, and host a small site with the pages you need. Then we will go on to setup some demo users and start testing.
GitHub site: https://github.com/InnovateAsterisk/Browser-Phone
For part 2 (With PJSIP) https://www.youtube.com/watch?v=azWUfSBz__s