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Chapter 11 Network Address Translation (NAT)
The following table describes the fields in this screen.
Table 49 Network Settings > NAT > DMZ
LABEL
Default Server
Address
Apply
Cancel
11.6 The ALG Screen
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 ZyXEL Device registers with the SIP register server, the SIP ALG translates the ZyXEL
Device'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 ZyXEL Device is behind a SIP ALG.
Use this screen to enable and disable the SIP (VoIP) ALG in the ZyXEL Device. To access this
screen, click Network Settings > NAT > ALG.
Figure 68 Network Settings > NAT > ALG
The following table describes the fields in this screen.
Table 50 Network Settings > NAT > ALG
LABEL
ALG
SIP ALG
Apply
Cancel
168
DESCRIPTION
Enter the IP address of the default server which receives packets from ports that
are not specified in the NAT Port Forwarding screen.
Note: If you do not assign a Default Server Address, the ZyXEL Device discards
all packets received for ports that are not specified in the NAT Port
Forwarding screen.
Click Apply to save your changes.
Click Cancel to restore your previously saved settings.
DESCRIPTION
Enable this to make sure applications such as FTP and file transfer in IM
applications work correctly with port-forwarding and address-mapping rules.
Enable this to make sure SIP (VoIP) works correctly with port-forwarding and
address-mapping rules.
Click Apply to save your changes.
Click Cancel to restore your previously saved settings.
P-873HNUP-51B User's Guide
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