aDisplays/hides all settings for a STUN server.

bSTUN server URL field, entry mandatory

cSTUN server port field, 1 … 65535.

dRegistration time lapse (min.), 5 … 60 minutes.

eDeletes the selected STUN server.

fAdds another STUN server to the list. The list is dynamic. Settings can be made for up to eight STUN servers.