MediaKeys accessing network unexpectedly

I see these messages in journalctl:

Dec 25 15:51:25 hostname org.gnome.SettingsDaemon.MediaKeys.desktop[23369]: [23732:23761:1225/155125.614204:ERROR:socket_manager.cc(125)] Failed to resolve address for stun.node4.co.uk., errorcode: -105
Dec 25 15:51:25 hostname org.gnome.SettingsDaemon.MediaKeys.desktop[23369]: [23732:23761:1225/155125.614279:ERROR:socket_manager.cc(125)] Failed to resolve address for stun.node4.co.uk., errorcode: -105
Dec 26 19:14:40 hostname org.gnome.SettingsDaemon.MediaKeys.desktop[23369]: [23732:23761:1226/191440.617989:ERROR:socket_manager.cc(125)] Failed to resolve address for stun.node4.co.uk., errorcode: -105
Dec 26 19:14:40 hostname org.gnome.SettingsDaemon.MediaKeys.desktop[23369]: [23732:23761:1226/191440.619042:ERROR:socket_manager.cc(125)] Failed to resolve address for stun.node4.co.uk., errorcode: -105

I am astonished to find that gsd-media-keys is initiating network activity with a host in a foreign county. My understanding of this daemon's purpose is that it runs the increase-volume command when I press the increase-volume key on the keyboard. I don't understand why this would involve network traffic to remote hosts.

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