US Robotics USR5462 User Manual page 44

Configuring the 802.11g 54Mbps Router
Special Applications
Some applications, such as Internet gaming, videoconferencing,
Internet telephony and others, require multiple connections. These
applications cannot work with Network Address Translation (NAT)
enabled. If you need to run applications that require multiple
connections, use the following screen to specify the additional public
ports to be opened for each application.
Specify the public port number normally associated with an
application in the Trigger Port field. Set the protocol type to TCP or
UDP, then enter the ports that the application requires.
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