ZyXEL VMG1312-B10A User Guide - Page 174
The ALG Screen
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Chapter 11 Network Address Translation (NAT) Figure 84 Network Setting > NAT > DMZ The following table describes the fields in this screen. Table 60 Network Setting > NAT > DMZ LABEL DESCRIPTION Default Server Enter the IP address of the default server which receives packets from ports that are not Address specified in the NAT Port Forwarding screen. Apply Cancel Note: If you do not assign a Default Server Address, the 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. 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 Device registers with the SIP register server, the SIP ALG translates the 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 Device is behind a SIP ALG. Use this screen to enable and disable the NAT and SIP (VoIP) ALG in the Device. To access this screen, click Network Setting > NAT > ALG. Figure 85 Network Setting > NAT > ALG VMG1312-B Series User's Guide 174