A router is a networking device that forwards data packets between computer networks. Routers perform the “traffic directing” functions on the Internet. A data packet is typically forwarded from one router to another through the networks that constitute the internetwork until it reaches its destination node. Wikipedia
You have to forward TCP port 8080 for the direct streaming on your website with Restreamer. Keyword for searching engines how portforwarding works in your router is: YourRouterName + Porforwarding). Only with 8080 forwarded the video player iframe on your website is able to communicate with your Restreamer.