> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://lasuite.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Technical sheet

| **This document is intended for individuals who wish to review the necessary network flows for the proper functioning of the tool: [visio.numerique.gouv.fr](https://visio.numerique.gouv.fr).**


### Introduction
The beta version of our application is currently under development. The production infrastructure has been deployed, and this document describes its final architecture.


### Technology
Our application is based on **WebRTC** technology to enable real-time audio and video communication. We use **LiveKit** as the main platform for stream management.


### Protocols
Media streams, in order of resolution priority:
1. **UDP**: the main protocol for fast and efficient data transmission.
2. **Unsecured TCP**: used when network restrictions prevent the use of UDP.
3. **TURN/UDP**: relaying through a TURN server using UDP.
4. **TURN/TLS** *(less recommended)*: secure relay via TLS, used if other options fail.
Signaling is handled via **WebSockets** for bidirectional communication between the client and the server.


### Domain name
![](https://storage.crisp.chat/users/helpdesk/website/-/3/6/a/f/36af3d17ac615200/capture-decran-2025-06-20-a-15_juoum4.png)

### Addresses and Ports
### LiveKit server (media and signaling)
![](https://storage.crisp.chat/users/helpdesk/website/-/3/6/a/f/36af3d17ac615200/capture-decran-2025-06-20-a-15_1yhveag.png)

### CoTurn server
![](https://storage.crisp.chat/users/helpdesk/website/-/3/6/a/f/36af3d17ac615200/capture-decran-2025-06-20-a-15_quciqk.png)

### Application server
![](https://storage.crisp.chat/users/helpdesk/website/-/3/6/a/f/36af3d17ac615200/capture-decran-2025-06-20-a-15_1jiu1pg.png)