Billion BiPAC 7300N User Manual page 110

5.3.6.3 ALG
Controls enable or disable various protocols over application layer.
For example, SIP ALG:
Enable: When SIP phone need ALG to pass through the NAT.
Disable: When SIP phone included NAT-Traversal algorithm. Turn off the SIP ALG.
Using port mapping does have security implications, since outside users
are able to connect to PCs on your network. For this reason you are
advised to use specific Virtual Server entries just for the ports your
application requires instead of simply using DMZ or creating a Virtual
Server entry for "All" protocols, as doing so results in all connection
attempts to your public IP address accessing the specified PC.
1. If you disable the NAT option in the WAN-ISP section, the Virtual
2. If the DHCP server option is enabled, you have to be very careful in
Attention
Server function becomes invalid.
assigning the IP addresses of the virtual servers in order to avoid
conflicts. The easiest way of configuring Virtual Servers is to manually
assign a static IP address to each virtual server PC, with an address
that does not fall into the range of IP addresses that are issued by the
DHCP server. You can configure the virtual server IP address
manually, but it must still be in the same subnet as the router.
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