Matrix VISIONPRO System Manual 112
Call Duration Control (CDC)
Call Duration Control (CDC) allows a maximum time limit to be set on internal and external (both incoming and
outgoing) phone calls. When the maximum call duration is reached, the calls are disconnected, after a warning tone
indicating to the user that the current call will be disconnected.
By limiting the duration of the conversations, CDC helps in increasing the availability of trunks which is important in
high call traffic situations. Besides increasing trunk availability, CDC curbs unrelated and unproductive
conversations.
How it works
VISIONPRO 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 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 the CDC Disconnection flag is
enabled).
• If the dialed number string matches with a number string that is available in both the Allowed and the
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 20 seconds 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/she has been talking.
If CDC is turned ON for Internal calls (both incoming and outgoing internal calls), the system does not
check the Denied list and applies CDC to all types of Internal calls.
If CDC is turned ON for Internal calls and CDC table is assigned to the calling party and called party, CDC
will be applied to the calling party only.
Warning Beep
CDC Warn Timer 20 Seconds
Total time after which call will be disconnected
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