ServerUplinkEx

Add the following to the list of ServerActors:
ServerActors=ServerUplinkEx_v2.ServerUplinkEx
This line needs to be below the UdpServerQuery ServerActor.

Add the following to your UnrealTournament.ini:

[ServerUplinkEx_v2.ServerUplinkEx]
MasterServers=(Address="unreal.epicgames.com",Port=27900)
UpdateMinutes=1

Add more master servers by adding MasterServers=(Address="masterserver.example.com",Port=27900) lines to that section.