Create a wordpress plugin to embed video conference

I need a wordpress plugin to do video conference. My project is like a call center, but I only use internet to it. My custumers can start a voice/video conference to ask for some helps. So once a custumer start a call, all my employees(they have WP admin panel aceess permission) need to receive the call, but only one of them can answer the call. Once someone answer the call, it should stop rings to othes. Requirements: - Always 1 x 1 person on the call. - I don’t wanna have to hosting/management video conference server, so you can use some existing video conference platform. - Need to support IE11, Edge, Firefox, Chrome, Safari (including to iOS 10 and lowers) - voice/video conference. - If using some video conference platform, need to be able to integrade wordpress user with the platform login.