ZyXEL VMG4380 User Guide - Page 188
The ALG Screen, The Address Mapping Screen
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Chapter 11 Network Address Translation (NAT) 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 84 Network Setting > NAT > ALG The following table describes the fields in this screen. Table 61 Network Setting > NAT > ALG LABEL DESCRIPTION NAT ALG Enable this to make sure applications such as FTP and file transfer in IM applications work correctly with port-forwarding and address-mapping rules. SIP ALG Enable this to make sure SIP (VoIP) works correctly with port-forwarding and addressmapping rules. Apply Click Apply to save your changes. Cancel Click Cancel to restore your previously saved settings. 11.7 The Address Mapping Screen Ordering your rules is important because the Device applies the rules in the order that you specify. When a rule matches the current packet, the Device takes the corresponding action and the remaining rules are ignored. Click Network Setting > NAT > Address Mapping to display the following screen. Figure 85 Network Setting > NAT > Address Mapping 188 VMG4380-B10A / VMG4325-B10A User's Guide
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