Ringing and push notifications not working on mobile and desktop

Even after enabling the notification settings on both Android and iOS devices, the device does not ring,

When direct calling on desktop, it rings but not for group calls.

Is this functionality still not available on free mattermost self hosted versions.

Are there any work arounds to add this functionality if these features are not yet properly implemented?

See if Mobile push notifications - Mattermost documentation and Enable push notifications - Mattermost documentation help.

Push notifications do work for free / self-hosted Mattermost.