Monoprice PID 8743 Wireless N ADSL2 Modem and Router 802 11N WPS Function 2T2R 300Mbps - Manual (Page 91)

ADSL2/2+ Router
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Click the checkbox to enable corresponding modulation modes, and
then click “Apply/Save” to complete the settings.
Note: If you are not familiar with the ADSL modulation modes, please
use the default settings.
4.2.14 UPnP
With UPnP (Universal Plug and Play) function, the host in LAN can
request the Router to carry specific port forwarding, thus the external
host can access the internal host for resources. For example, the MSN
Messenger under Windows XP and Windows Me can utilize UPnP in
video and audio communication, thus the function restricted by NAT
can restore its normal use. Enable UPnP to help support applications
that would not otherwise work behind a Router. Both UPnP Internet
Gateway Device and NAT Traversal are supported.