Linksys SPA921 Cisco SPA9000 Voice System Using Setup Wizard Installation and - Page 114

Modifying the NAT Settings, Setting an External IP Address EXT IP

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Maintaining Your SPA9000 Voice System Using the Advanced Features Menu 6 Modifying the NAT Settings The SPA9000 NAT Traversal page helps you to modify the SPA9000 NAT traversal mechanisms. You can find this page under Main Menu > Advanced Features > NAT Settings. NOTE Modify your NAT settings ONLY with guidance from your ITSP. Setting an External IP Address (EXT IP) Configuring NAT mapping in the SPA9000 is recommended only if the ITSP network does not provide a Session Border Controller functionality. In this case, you can set an external (public) IP address to perform a static (permanent) mapping on SPA9000. This solution requires that the following conditions are met: • The external (public) IP address is static. • The router uses a symmetric NAT mechanism. • The LAN switch is configured to enable Spanning Tree Protocol and Port Fast on the ports to which the SPA9000 and the SPA9xx phones are connected. See "Connecting and Configuring the Switch," on page 38. SPA9000 Voice System Installation and Configuration Guide for Setup Wizard 112

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Maintaining Your SPA9000 Voice System
Using the Advanced Features Menu
SPA9000 Voice System Installation and Configuration Guide for Setup Wizard
112
6
Modifying the NAT Settings
The SPA9000 NAT Traversal page helps you to modify the SPA9000 NAT traversal
mechanisms. You can find this page under Main Menu > Advanced Features > NAT
Settings.
NOTE
Modify your NAT settings ONLY with guidance from your ITSP.
Setting an External IP Address (EXT IP)
Configuring NAT mapping in the SPA9000 is recommended only if the ITSP
network does not provide a Session Border Controller functionality. In this case,
you can set an external (public) IP address to perform a static (permanent)
mapping on SPA9000. This solution requires that the following conditions are met:
•
The external (public) IP address is static.
•
The router uses a symmetric NAT mechanism.
•
The LAN switch is configured to enable Spanning Tree Protocol and Port Fast
on the ports to which the SPA9000 and the SPA9xx phones are connected.
See
“Connecting and Configuring the Switch,” on page 38
.