Matrix PRASAR UCS System Manual 641
Call Duration Control (CDC)
What's this?
Call Duration Control (CDC) allows a maximum time limit to be set on internal and external (both incoming and
outgoing) telephone calls. When the maximum call duration is reached, the calls are disconnected, after a warning
tone indicating to the user that the calls in progress will be disconnected.
By limiting the duration of the conversations, CDC helps increase availability of trunks for making outgoing calls
and for receiving incoming calls, which is important in high call traffic situations. Besides increasing trunk
availability, CDC curbs unrelated and unproductive conversations.
How it works
• A is an extension user. B is an external number.
External-Outgoing Calls
• A dials B's number.
• The system checks the CDC Table applied to A.
• PRASAR UCS will check whether the CDC is applicable on Extension of A as well as the Trunk used for
making the outgoing call.
To check whether CDC is applicable on Extension A
• The system checks the CDC Table selected in the Station Advanced Feature Template assigned to A.
• In the CDC Table, it checks whether the check box, Apply CDC for outgoing calls made from trunk,
is enabled.
• It matches B's number with the entries on the Apply CDC for calls matching with numbers list and
the Do Not Apply CDC for calls matching with numbers list in the CDC table.
To check whether CDC is applicable on the Trunk
• The system checks the Apply CDC for Outgoing Calls check box in the Trunk Features Template
assigned to the trunk.
The following results are possible:
• In the CDC Table, the Apply CDC for outgoing calls made from trunk check box is enabled and a
match is found for the number in the Apply CDC for calls matching with numbers List. The Apply
CDC for outgoing calls check box is enabled in the Trunk Features Template assigned to the trunk.
CDC is applied on the call.
• In the CDC Table, the Apply CDC for outgoing calls made from trunk check box is enabled and a
match is found for the number in the Apply CDC for calls matching with numbers List. The Apply
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