WebRTC Browser Calling: How It Works and Why You Need It
Technology · 2026-04-10 · 7 min read
What is WebRTC?
WebRTC (Web Real-Time Communication) is an open standard built into every modern browser — Chrome, Firefox, Safari, and Edge. It enables real-time audio, video, and data communication directly between browsers without plugins or app downloads. Google Meet, Discord, and WhatsApp calls all rely on WebRTC. It is not experimental — it handles billions of minutes of communication every day.
How browser-to-browser calling works
When a visitor on your website clicks your call button, their browser establishes a peer connection with your agent's browser. The audio stream travels over the internet, encrypted end-to-end using DTLS-SRTP (the same standard as financial institutions). No phone line is involved. No PSTN. No per-minute charge. Just two browsers, a secure connection, and a voice conversation.
Why WebRTC beats traditional calling for websites
Traditional click-to-call requires the visitor to have a phone number dialed or an app installed. WebRTC requires nothing — just the browser they are already using. The result: zero friction for the visitor, instant connection, and zero per-minute cost for your business. For website-originated conversations, WebRTC is simply the better tool.
What about firewalls and NAT?
WebRTC uses ICE (Interactive Connectivity Establishment) to find the best path between two browsers. When a direct peer-to-peer connection is blocked by a corporate firewall or NAT, WebRTC falls back automatically to a TURN relay server. WebCallHub includes a global TURN network so calls connect reliably from anywhere — corporate offices, VPNs, mobile networks.
Security: mandatory encryption
WebRTC mandates DTLS-SRTP encryption for all media streams. This is not optional — it is baked into the specification and enforced by every browser. Your calls are encrypted in transit from the visitor's microphone to your agent's speaker, with keys that are negotiated per-session and never reused. This is stronger than most traditional VoIP deployments.
How to add WebRTC calling to your website
You do not need to understand WebRTC internals to use it. WebCallHub handles all the complexity — signaling, ICE negotiation, TURN fallback, media routing — behind a single script tag. Sign up at webcallhub.com, add the widget to your site, and your visitors can make WebRTC calls to your team in under 2 minutes. Free plan available with no credit card required.