WebRTC (Web Real-Time Communication) is a free, open-source project that provides web browsers and mobile applications with real-time communication (RTC) via simple application programming interfaces (APIs). It allows audio and video communication to work inside web pages by allowing direct peer-to-peer communication, eliminating the need to install plugins or download native apps.
Don't Let Your VPN Spring a Leak! - What Is My IP Address Here is the key step: Visit this WebRTC test page and note the IP address displayed on the page. If the WebRTC test shows your normal IP address, then your browser is leaking your ISP-provided address to … Pre-call Test - TokBox Test the hardware & software setup on the end-point (Camera, Microphone, Browser) When prompted, allow us to use your camera and audio hardware. In order to get results, this test will last for 30 seconds. Before it starts. Make sure you are on the specific network you intend to test;
WebRTC/Test Plan/Peer Connection - MozillaWiki
How to use DetectRTC?