Rugged Cams Premier DVR - Manual (Page 146)

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B) PSTN/ISDN ISP
This is used when the communication environment is established through an ISP provider.
Move the focus to the {PSTN} using the direction (W X) buttons in the {Network} setup menu,,
and press the [SELECT] button.
Use the [TAB] button or direction (W X) buttons for movement in items to set values as shown
below.