Before going further download the local server .zip from here.Once you download the server unzip it.You will find multiple file inside it.Now open the Terminal for server installation and Start.
Signalling Server Files
Open terminal and Drag and drop the server folder on terminal.
First you must have to download the npm
Before start the server install all required things using npm install
For start the server fire the npm start command.
All required commands for start the server.
When signalling server start successfully.
Once server installed successfully you will now able to open the webPortal for call.