The Alg Screen - ZyXEL Communications VMG5313-B30A User Manual

Figure 81 Network Setting > NAT > DMZ
The following table describes the fields in this screen.
Table 60 Network Setting > 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 VMG registers with the SIP register server, the SIP ALG translates the VMG'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 VMG is behind a SIP ALG.
Use this screen to enable and disable the NAT and SIP (VoIP) ALG in the VMG. To access this
screen, click Network Setting > NAT > ALG.
Figure 82 Network Setting > NAT > ALG
Chapter 11 Network Address Translation (NAT)
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 VMG 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.
VMG5313-B10A/-B30A Series User's Guide
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