Gateway IP Address. Enter â0.0.0.0â. Destination. Enter the IP address of the default. router. The Line item in the Manager Configuration Tree is used to configure lines on IP Office. Right click in the Line field and select âNewâ then âSIPâ. Select âLAN1â from the drop-down.list.he status of the newly installed license will show Unknown next to the name of the license until the configuration is saved and the control unit is rebooted. After the reboot use Manager to retrieve the configuration again and check that the status of the license is Valid.