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| Chapter 9 Network Address Translation (NAT) |
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| Table 45 Network > NAT > Address Mapping: Edit (continued) | |
| LABEL | DESCRIPTION |
| Global End IP | This is the ending global IP address (IGA). This field is N/A for |
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| Server | Click this link to go to the Port Forwarding screen to edit a port |
| Mapping Set | forwarding set that you have selected in the Server Mapping Set field. |
| Edit Details |
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| Back | Click this to return to the previous screen without saving. |
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| Apply | Click this to save your changes. |
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| Cancel | Click this to restore your previously saved settings. |
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9.5 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 > NAT > ALG.
Figure 69 Network > NAT > ALG
The following table describes the fields in this screen.
Table 46 Network > NAT > ALG
LABEL | DESCRIPTION |
Enable SIP ALG | Select this to make sure SIP (VoIP) works correctly with port- |
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Apply | Click this to save your changes. |
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Reset | Click this to restore your previously saved settings. |
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