Polycom ViewStation EX Administrator's Manual page 56

Administrator's Guide for ViewStation EX, ViewStation FX, and VS4000
3-8
Setting Description
NAT Public (WAN) Displays the address that callers from outside the LAN use to call
Address your system. If you chose to configure the NAT manually, enter
the NAT Public Address here.
The system restarts if you change this setting.
Address Displayed in Lets you choose whether to display this system's public or private
Global Address Book address in the Global Address Book.
www.polycom.com/videodocumentation