Gateway none - Manual (Page 63)

4-27
CHAPTER 4
Specify the port normally associated with an application in
the "Trigger Port" field, select the protocol type as TCP or
UDP, and then enter the public ports associated with the
trigger port to open them for inbound traffic.
Note:If an application still cannot function correctly after
enabling multiple ports via the Special Application
screen, you may have to open the client PC for full
Internet access using the DMZ Host option.