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Table 30 Network > NAT > Address Mapping: Edit (continued)
LABEL
Server
Mapping Set
Edit Details
Back
Apply
Cancel
9.5 The ALG
Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG
allows SIP calls to pass through NAT by examining and translating IP addresses
embedded in the data stream. When the IAD registers with the SIP register server,
the SIP ALG translates the IAD's private IP address inside the SIP data stream to a
public IP address. You do not need to use STUN or an outbound proxy if your IAD
is behind a SIP ALG.
Use this screen to enable and disable the SIP (VoIP) ALG in the IAD.
screen, click Network > NAT > ALG.
Figure 48 Network > NAT > ALG
Each field is described in the following table.
Table 31 Network > NAT > ALG
LABEL
Enable SIP ALG
Apply
Reset
IAD User's Guide
DESCRIPTION
Only available when Type is set to Server.
Select a number from the drop-down menu to choose a port forwarding
set.
Click this link to go to the Port Forwarding screen to edit a port
forwarding set that you have selected in the Server Mapping Set field.
Click Back to return to the previous screen.
Click Apply to save your changes to the IAD.
Click Cancel to begin configuring this screen afresh.
Screen
DESCRIPTION
Select this to make sure SIP (VoIP) works correctly with port-
forwarding and address-mapping rules.
Click this to save your changes and to apply them to the IAD.
Click this to return to previously saved configuration.
Chapter 9 Network Address Translation (NAT)
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