NetComm V431 Quick Start Manual page 7

The router side:
The router needs to be configured to forward a specific range of ports to the private IP address of the V431,
on which ports the V431 listens for VoIP signaling and will send/receive RTP traffic. This type of setting is
normally under router "Port Forwarding" or "Virtual Server" section.
The following image Fig 2-2 comes from NetComm's NB620W Wireless Router. It illustrates the NB620W
forwarding UDP port 5988 and UDP ports UDP 9000 ~ 9008 to 192.168.1.131, which is the IP address of
the V431.
The following image Fig 2-3 illustrates the settings on the V431. The V431 uses a static LAN IP
192.168.1.131. The 'listen' port and RTP port base have to match the settings in the NB620W as shown
above. Note: the number of RTP ports used by the V431 is based on the total number of FXS and FXO ports.
Each FXS/FXO port requires two UDP ports. So for the V431 (3FXS +1FXO) it needs 8 ports and the actual
RTP UDP port range is RTP port base ~ RTP port base + twice of total number of FXS/FXO ports (port
9000~9008 in this example)
YML859 Rev1
www.netcomm.com.au
Fig -: NB0 router port forwarding setting
Fig -3
V431 VoIP Gateway Quick Start Guide V431 VoIP Gateway Quick Start Guide