D-Link DVG-6004S User Manual page 48

Direct Connection to PSTN
36008913
36008914
Connect one of the trunk lines to the Gateway FXO Port (For MODEL 2S2O, please
connect to P3).
The line of "Dial Number" (36008913) must be hook on.
Detect Channel: Enter 3 (The trunk line is connected to P3, and uses P3 for outgoing
detection).
Phone Number: Enter the number of the FXO line.
Dial Number: Enter the number of the end to be tested—36008913.
CPT grout: Enter the group that after testing to replace with.
Finally, click the "Accept" button.