Philips CPWBS154 Instructions For Use Manual page 41

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Special Applications
Some applications require multiple connections, such as Internet gaming,
video-conferencing, and Internet telephony.
These applications may not work when Network Address Translation (NAT)
is enabled. If you need to run applications that require multiple connections,
use these pages to specify the additional public ports to be opened for
each application.
NAT Mapping Table
This page displays the current NAPT (Network Address Port Translation)
address mappings.