The „wrongversion“ module for Mumble Moderator checks the version information of Mumble clients connecting to your server and sends them an update notification if their client is older than the latest available version.
This affects for example Linux users who use their distribution packages of Mumble.
The reason is that one can’t manage all the different stable versions of Mumble in all distributions.
He also improved the version check of mobile clients.
The module can be found on GitHub, see here.