D-Link DVG-6004S User Manual page 47

Detect function to prevent the FXO from engaging a line. However, if the line of the receiving party
is engaged and his/her PSTN uses a voice prompt to replace the traditional beep sound, then the
system would not be able to detect a busy tone. Drop Inactive Call should then be used to
determine whether or not to end the call.
CPT Auto Detect
2 PSTN phone numbers or 2 PBX extension lines are needed.
Connect one of the phone sets to the FXO port (P3 or P4 of MODEL 2S2O).
The line of "Dial Number" must be hook on. Set the outgoing phone number the same as
the phone line that is in use as above, and click the "Accept" button to start detection.
If detection is successful, the parameters obtained will automatically be inserted into the
CPT parameter.
Save settings and restart the system.
Detailed description is given below:
Click "CPT auto detect" at the bottom of Trunk CPT Settings.
If CPT auto detect is used, the function would halt every operation of the Gateway. Select "I am sure of it",
and then click the "Accept" button. Wait for 15 seconds, and then you will enter CPT auto detect window.
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