FXS Gateway Overview
1. The WAN IP Address obtained from ADSL has two kinds of methods.
One is fixed IP Address, while user applies for one or more fixed IP Addresses.
Another is dynamic IP Address while user applies for dial-up connection way.
2. The LAN IP Address of User’s PC can be set as DHCP client in order to gain a valid one.
3. One can also assign a fixed IP address, which belongs to the same network segment as the
LAN interface of IP Sharing device.
4. FXS Gateway must enable the IP Sharing function for the fixed / dynamic WAN IP
Address.
Fixed IP Address
– usr/config$ ifaddr –ipsharing 1 210.11.22.33
Please be noted
With Dynamic WAN IP Address, when the WAN IP is changed, we need to change the
external IP of FXS Gateway using above command.
5. IP Sharing device must have a function to do IP/Port mapping. Some is named as DMZ,
some is named as virtual server whatever. The VoIP message from WAN has to completely
pass forward to the LAN. It is said if the FXS Gateway is assigned a virtual fixed IP
Address such as 192.168.1.5, IP Sharing device must forward the VoIP message to
192.168.1.5.
Please see following for example:
Initial Configuration
3-4
>Advanced setting > NAT setting > DMZ Host setting
DMZ Host setting
