D-Link DVG-6004S User Manual page 49

Connected to a PBX Extension Line
If the gateway is connected to a PBX extension line, then the busy tone of both the PBX and the PSTN
must be detected.
Connecting to a PBX extension line and detecting the busy tone of the PBX
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Connect one of the PBX extension lines to the Gateway FXO Port (For MODEL 2S2O,
connect the line to P3).
Detect Channel: Enter 3 (The trunk line is connected to P3, and uses P3 for outgoing
detection).
Phone Number: Set the number of FXO line –to detect Reorder Tone.
Dial Number: Enter the number of the end to be tested—307.
Save detect value to CPT group: Enter the group that after testing to replace with.
Finally, click the "Accept" button.
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