LevelOne VOI-8001 - Manual (Page 105)

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4.2.8.6 UPnP Settings
UPnP
Enable UPnP
Check this item to enable UPnP.
UPnP Port Number
Set UPnP port number to announce to the UPnP control points. The UPnP
control points use this TCP port to send request to the home gateway.
Advertise Time (60-1800)
Set the time interval after which the home gateway sends advertisement
packets.
Subscribe Timeout (60-1800)
The UPnP control point subscribes a request to the home gateway. The
home gateway keeps the request until the control point renew it,
unsubscribe it or after timed-out. This item set the timeout value of the
subscribe requests.