Matrix Vision System Manual page 49

How it works?
• Vision uses Allowed Lists and Denied Lists to support this feature.
• When a call is made, the system compares each digit of the dialed number string with the number strings in
Allowed List and Denied List.
• If the dialed number string matches with any of the number strings available in allowed list, the system treats
CDC to be OFF and does not disconnect the call.
• If the dialed number string matches with any of the number strings available in denied list, the system treats
CDC to be ON and disconnects the call after CDC timer (Provided CDC Disconnection flag is enabled)
• If the dialed number matches with a number string that is available in both allowed and denied list then
allowed list is given priority and the system treats CDC to be OFF.
• The system gives warning beep to the user on expiry of the CDC timer. The call continues for another 20
seconds after the beep and gets disconnected if the disconnection flag is enabled. This timer is fixed.
• If the disconnection flag is disabled then the system does not disconnect the call but reloads the CDC timer
again. The system gives warning beeps every time the CDC timer is matured. This helps the user to know
the duration for which he has been talking.
CDC Warn Timer
How to program?
Step 1: Take a pen and a paper pad. Decide the types of Call Duration Controls to be programmed for each
station
Step 2: If the requirement can be met by using default CDC tables, assign a default CDC table to a station
using command 4920.
Step 3: If the requirement cannot be met by default CDC tables then program all the parameters of a CDC
table like Enable CDC for Outgoing call/Incoming call, disconnection flag, CDC timer, etc. This
programs one complete CDC table. Program remaining three CDC tables likewise, if required.
Step 4: Assign the CDC table to the station using command 4920.
Step 5: A CDC table can be set to default using command 4901.
By default, all stations are assigned CDC table 0.
Commands
Step 1
Take a pen and a paper pad. Decide the type of calls viz. Outgoing or Incoming for which CDC is to be
enabled.
Step 2
Use following command to assign a CDC table to a station user:
4920-1-Station-CDC table
Where,
Station is from 00 to 08.
CDC table is from 0 to 3.
Use following command to assign same CDC table to all stations:
4920-*-CDC Table
Vision System Manual
Total time after which call will be disconnected
Warning Beep
20 Seconds
Matrix
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