71
SIP Operation Manual
UDT Detection
If the CPT auto detect function is not able to determine whether or not a PSTN-call receiving party
has hung up the phone, then the UDT detection function can serve as a back up. To do this, enter
the high/low frequency parameters from the CPT table into the UDP table.
NOTE: To cope with different local PSTN and different PBX models, the gateway provides CPT Auto
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
gateway 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.
