Make sure the players who want to use voice chat have the mod installed on
their clients - there’ll be guides online for this, and can be done easily
using the Modrinth App
Installing
Plugin-Based Server
If you’re running Paper or a plugin-based server version (recommended - can be changed via Software tab), just go to the Plugins tab and install Simple Voice Chat from the list by pressing the download icon on the right, and then the Install button.
Modded Server
If running a modded server version like Forge or Fabric, download the mod from Modrinth and place it in themods folder of your server, via the Files tab.