Fediversity/matrix/call

Table of Contents

• Element Call
• Install prerequisites
• Livekit

Element Call

Element Call enables users to have audio and videocalls with groups, while maintaining full E2E encryption.

It requires several bits of software and entries in .well-known/matrix/client

This bit is for later, but here's a nice bit of documentation to start:

https://sspaeth.de/2024/11/sfu/

Install prerequisites

Define an entry in DNS for Livekit and Call, e.g. livekit.matrixdev.example.com and call.matrixdev.example.com. Get certificates for them.

Expand .well-known/matrix/client to contain the pointer to the SFU:

"org.matrix.msc4143.rtc_foci": [
      {
        "type": "livekit",
        "livekit_service_url": "https://livekit.matrixdev.example.com"
      }
  ]

Create .well-known/element/element.json, which is opened by Element-web and ElementX to find the Element Call widget. It should contain something like this:

{
    "call": {
        "widget_url": "https://call.matrixdev.example.com"
    }
}

Make sure it is served as application/json, just like the other .well-known files.

Livekit

Livekit is a small Go program that handles authorization tokens. You'll need a Go compiler, so install that:

apt install golang