AirLive Traveler3GM - Manual (Page 60)

3. Making Configuration
Traveler3G M User‟s Manual
 Special AP
Some applications require multiple connections, like Internet games, Video
conferencing, Internet telephony, etc. Because of the firewall function, these
applications cannot work with a pure NAT router. The Special Applications feature
allows some of these applications to work with this product. If the mechanism of
Special Applications fails to make an application work, try setting your computer as
the DMZ host instead.
Trigger: the outbound port number issued by the application.
Incoming Ports: when the trigger packet is detected, the inbound packets sent to
the specified port numbers are allowed to pass through the firewall.