WebRTC: a browser on one side and a server with a microphone and speaker on the other - is it real?

Question

WebRTC

I welcome everyone!
It so happened that I myself can’t figure it out yet and for the first time in my life I have to ask for help from the community.
The essence of the question is this, I wanted to implement the following thing - a camera, a microphone and speakers in the server room connected to a machine with freebsd or linux on board, and if it is not possible to arrive promptly at the place, you need to manage "remote hands" but there is no mobile network in that room. The idea is this - to look through the browser what is happening there and communicate with a person, I have a browser (computer or mobile phone) and he has speakers and a microphone. There are no problems with video transmission in one direction, but there is a problem with communication
. ?