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Chapter 9 Network Address Translation (NAT)
AMG1202-T10A User’s Guide
135
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 70
Network > NAT > ALG
The following table describes the fields in this screen.
9.6 NAT Technical Reference
This chapter contains more information regarding NAT.
9.6.1 NAT Definitions
Inside/outside denotes where a host is located relative to the ZyXEL Device, for example, the
computers of your subscribers are the inside hosts, while the web servers on the Internet are the
outside hosts.
Back
Click this to return to the previous screen without saving.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Table 45
Network > NAT > Address Mapping: Edit (continued)
LABEL
DESCRIPTION
Table 46
Network > NAT > ALG
LABEL
DESCRIPTION
Enable SIP ALG
Select this to make sure SIP (VoIP) works correctly with port-forwarding and
address-mapping rules.
Apply
Click this to save your changes.
Reset
Click this to restore your previously saved settings.
Summary of Contents for AMG1202-T10A
Page 2: ......
Page 6: ...Document Conventions AMG1202 T10A User s Guide 6 Server Firewall Telephone Router Switch ...
Page 8: ...Safety Warnings AMG1202 T10A User s Guide 8 ...
Page 10: ...Contents Overview AMG1202 T10A User s Guide 10 ...
Page 18: ...Table of Contents AMG1202 T10A User s Guide 18 ...
Page 19: ...19 PART I User s Guide ...
Page 20: ...20 ...
Page 26: ...Chapter 1 Introduction AMG1202 T10A User s Guide 26 ...
Page 32: ...Chapter 2 The Web Configurator AMG1202 T10A User s Guide 32 ...
Page 36: ...Chapter 3 Status Screens AMG1202 T10A User s Guide 36 ...
Page 53: ...53 PART II Technical Reference ...
Page 54: ...54 ...
Page 84: ...Chapter 6 WAN Setup AMG1202 T10A User s Guide 84 ...
Page 96: ...Chapter 7 LAN Setup AMG1202 T10A User s Guide 96 ...
Page 126: ...Chapter 8 Wireless LAN AMG1202 T10A User s Guide 126 ...
Page 142: ...Chapter 10 Firewall AMG1202 T10A User s Guide 142 ...
Page 148: ...Chapter 11 Filters AMG1202 T10A User s Guide 148 ...
Page 152: ...Chapter 12 Static Route AMG1202 T10A User s Guide 152 ...
Page 158: ...Chapter 13 802 1Q 1P AMG1202 T10A User s Guide 158 ...
Page 166: ...Chapter 14 Quality of Service QoS AMG1202 T10A User s Guide 166 ...
Page 202: ...Chapter 19 Logs AMG1202 T10A User s Guide 202 ...
Page 223: ...Chapter 23 Product Specifications AMG1202 T10A User s Guide 223 ...
Page 224: ...Chapter 23 Product Specifications AMG1202 T10A User s Guide 224 ...
Page 264: ...Appendix C Pop up Windows JavaScripts and Java Permissions AMG1202 T10A User s Guide 264 ...
Page 278: ...Appendix D Wireless LANs AMG1202 T10A User s Guide 278 ...
Page 286: ...Appendix F Legal Information AMG1202 T10A User s Guide 286 ...
Page 294: ...Index AMG1202 T10A User s Guide 294 ...