Snom 4S NAT Filter Admin Manual page 8

• The third exception occurs when the filter queries a web server for
routing information. In this case, it will send a provisional response
to stop the UAC from repeating messages.
These three exceptions make sure that all user agents will work
behind NAT, no matter what NAT-type or how many NAT-levels are being
used. If user agents support ICE, they will automatically find the shortest
media path to the other party (peer-to-peer).
Also, please make sure that you have the necessary administrator
rights to run Windows services.
8 • Overview
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