LevelOne VOI-7011 - Manual (Page 105)

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SIP Settings
You have to enter the Display Name, User Name, Registered
Name, Registered Password, Domain Server, Proxy Server,
Outbound Proxy. After finished the setting, click the Submit
button and the Save Change button. The IP Phone will reboot
automatically. After boot up, the SIP setting page will show
“Registered”, and the LCD will show registered
number>; it will shows “No service” otherwise.