Rugged Cams Workhorse DVR 4 Channel - Manual (Page 136)

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(3) PSTN/ISDN
Sets the PSTN/ISDN modem
A) PSTN/ISDN 1:1
Used when the remote access software is connected to the DVR at a ratio of 1:1
On the Network Setup menu, go to {PSTN} using the arrow (W X) buttons and press the
[Select] button.
To select 1,2, or3 , use the [Tab]
button. For others, use the arrow (W X) buttons.