WebRTC App for Real Estate

We need a WebRTC application for our real estate website where users (property owner and users) can make ''Voice call'' to each other, but with a group call to Admin' account. For example, user A will call user B, firstly call will be connected to ''Available'' admin user, if Admin user accepts the call then it will be connected to user B. So each will be a Group call between, user A, user B, and Admin user. 1)- There will be ''Call'' button on each property detail page and within dashboard of each user. 2)- There will be a History feature which will contain all log of calls including missed calls from other users. 3)- A number will be assigned to each user within dashboard to make call to other user by entering the number of other user. 4)- It will be a separate wordpress plugin which be installed and uninstalled without any issue with the website.