WebRTC

WebRTC (Web Real-Time Communication) is a browser-based technology that enables voice and video communication directly within a web browser without requiring plugins or external softphone applications. In VICIdial, WebRTC allows agents to make and receive calls through their agent screen browser interface, eliminating the need for separate SIP phone hardware or software.

How It Works in VICIdial

VICIdial’s WebRTC implementation connects the agent’s browser to Asterisk using WebSocket transport with the PJSIP channel driver. When an agent logs in with WebRTC enabled, the browser establishes a secure WebSocket connection to Asterisk, which acts as the WebRTC gateway. Audio is transmitted using the Opus codec (the standard WebRTC audio codec) and encrypted with SRTP.

The agent’s browser handles microphone access, echo cancellation, and noise suppression natively — features that vary in quality across different browser implementations. Chrome-based browsers generally provide the best WebRTC audio quality for VICIdial. The WebRTC endpoint appears to Asterisk as a standard PJSIP extension, so no special dialer configuration is needed.

WebRTC connections traverse NAT using ICE (Interactive Connectivity Establishment) with STUN/TURN servers, which is generally more reliable than traditional SIP NAT traversal.

Why It Matters

WebRTC dramatically simplifies agent deployment — agents only need a browser and a headset, with no software installation or SIP phone configuration required. This reduces IT setup time per agent from hours to minutes and enables rapid scaling of remote agent teams. It also eliminates softphone licensing costs.

The trade-off is that WebRTC audio quality depends on the agent’s browser, computer performance, and network conditions. For high-volume production environments, dedicated SIP phones or softphones still offer more consistent audio quality. WebRTC is ideal for remote agents, work-from-home teams, and rapid deployment scenarios. See the VICIdial 3.14 new features guide for WebRTC configuration details.