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Chapter 9 Network Address Translation (NAT)
P-660HN-F1A User’s Guide
183
9.5 The SIP 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 P-660HN-F1A registers with the SIP
register server, the SIP ALG translates the P-660HN-F1A’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 P-660HN-F1A is behind a SIP ALG.
Use this screen to enable and disable the SIP (VoIP) ALG in the P-660HN-F1A. To
access this screen, click Network > NAT > ALG.
Figure 71
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 P-660HN-F1A, for
example, the computers of your subscribers are the inside hosts, while the web
servers on the Internet are the outside hosts.
Global/local denotes the IP address of a host in a packet as the packet traverses a
router, for example, the local address refers to the IP address of a host when the
Table 49
Network > NAT > ALG
LABEL
DESCRIPTION
Enable SIP ALG
Select this to change the private ports or IP in SIP messages so that the
VoIP client behind the P-660HN-F1A can be found in RTP traffic.
Apply
Click this to save your changes.
Reset
Click this to restore your previously saved settings.
Summary of Contents for P-660HN-F1A
Page 2: ......
Page 10: ...Contents Overview P 660HN F1A User s Guide 10...
Page 20: ...Table of Contents P 660HN F1A User s Guide 20...
Page 21: ...21 PART I User s Guide...
Page 22: ...22...
Page 36: ...Chapter 2 Introducing the Web Configurator P 660HN F1A User s Guide 36...
Page 44: ...Chapter 3 Status Screens P 660HN F1A User s Guide 44...
Page 84: ...Chapter 4 Tutorials P 660HN F1A User s Guide 84 Physical Port 1 3 exclude port 4 3 Click Apply...
Page 88: ...Chapter 4 Tutorials P 660HN F1A User s Guide 88...
Page 103: ...103 PART II Technical Reference...
Page 104: ...104...
Page 142: ...Chapter 7 LAN Setup P 660HN F1A User s Guide 142...
Page 188: ...Chapter 9 Network Address Translation NAT P 660HN F1A User s Guide 188...
Page 210: ...Chapter 10 Firewalls P 660HN F1A User s Guide 210...
Page 236: ...Chapter 13 Certificates P 660HN F1A User s Guide 236...
Page 240: ...Chapter 14 Static Route P 660HN F1A User s Guide 240...
Page 276: ...Chapter 17 Dynamic DNS Setup P 660HN F1A User s Guide 276...
Page 288: ...Chapter 18 Remote Management P 660HN F1A User s Guide 288...
Page 344: ...Chapter 24 Troubleshooting P 660HN F1A User s Guide 344...
Page 376: ...Appendix A Setting up Your Computer s IP Address P 660HN F1A User s Guide 376...
Page 386: ...Appendix B Pop up Windows JavaScripts and Java Permissions P 660HN F1A User s Guide 386...
Page 396: ...Appendix C IP Addresses and Subnetting P 660HN F1A User s Guide 396...
Page 420: ...Appendix F Legal Information P 660HN F1A User s Guide 420...
Page 430: ...Index P 660HN F1A User s Guide 430...