phone sets of many kinds for calling and video
video room systems are continuing to evolve and now offer fully video zoom capable USB options
software clients: Windows PC/tablet, Mac, tablet and phones can create and join any call and video conference
WebRTC is a free, open project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs.
The WebRTC mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.