Zoom Gateway/Router V3 User Manual page 24

If your service provider did not give you a Server Address but
provided you with a User ID and a Password, you will configure
your V3 manually. Go to Manual Account Configuration on page
26.
Auto Account Configuration
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Open the Voice Over IP page.
Click the Zoom V3 icon on your desktop, then the Voice over IP
icon at the top of the opening page to display the Voice over IP
setup page.
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Under Basic Setup, in the Server box enter the Server
address given to you by your provider.
24 Zoom V3 User's Guide