# How WebRTC Scales: Signaling, NAT Traversal, and the Mesh/SFU/MCU Tradeoff

DevFeed: [How WebRTC Scales: Signaling, NAT Traversal, and the Mesh/SFU/MCU Tradeoff](<https://devfeed.tech/articles/how-webrtc-scales-signaling-nat-traversal-and-the-mesh-sfu-mcu-tradeoff-26901.md>)

Original publisher: [Read original article](<https://www.freecodecamp.org/news/how-webrtc-scales-signaling-nat-traversal-and-the-mesh-sfu-mcu-tradeoff/>)

Author: Karan Pratap Singh

Published: 2026-09-15T15:57:39Z

Content type: article

Language: en

Sources: [freeCodeCamp Programming Tutorials: Python, JavaScript, Git & More](<https://devfeed.tech/sources/freecodecamp-programming-tutorials-python-javascript-git-more.md>)

Topics: [WebRTC](<https://devfeed.tech/topics/webrtc.md>), [real-time](<https://devfeed.tech/topics/real-time.md>), [browsers](<https://devfeed.tech/topics/browsers.md>), [API](<https://devfeed.tech/topics/api.md>), [JavaScript](<https://devfeed.tech/topics/javascript.md>), [WebSocket](<https://devfeed.tech/topics/websocket.md>), [Firewall](<https://devfeed.tech/topics/firewall.md>), [Network](<https://devfeed.tech/topics/network.md>), [servers](<https://devfeed.tech/topics/servers.md>)

Tags: [api](<https://devfeed.tech/tags/api.md>), [browsers](<https://devfeed.tech/tags/browsers.md>), [decoding](<https://devfeed.tech/tags/decoding.md>), [distributed-system](<https://devfeed.tech/tags/distributed-system.md>), [firewall](<https://devfeed.tech/tags/firewall.md>), [http](<https://devfeed.tech/tags/http.md>), [javascript](<https://devfeed.tech/tags/javascript.md>), [network](<https://devfeed.tech/tags/network.md>), [networking](<https://devfeed.tech/tags/networking.md>), [real-time](<https://devfeed.tech/tags/real-time.md>), [server](<https://devfeed.tech/tags/server.md>), [webrtc](<https://devfeed.tech/tags/webrtc.md>)

## AI overview

This article explains how WebRTC enables browsers to exchange audio, video, and data directly. It covers the three WebRTC APIs, signaling through WebSockets or HTTP, NAT traversal using ICE, STUN, and TURN, and the mesh, SFU, and MCU approaches to scaling media delivery.

## Source excerpt

Web Real-Time Communication (or WebRTC) is the open standard browsers use to send audio, video, and data straight to each other. There's no plugin or native app, nothing beyond an API that every brows