396 Matrix ETERNITY NE System Manual
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.
At a time, ETERNITY NE can control the duration of 64 calls.
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 Profile applied to A.
• It checks whether the flag, Apply CDC to Outgoing Calls made from Trunks, 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 profile. Three results are possible:
• The flag is enabled and a match is found for the number in the Apply CDC for calls matching with
numbers List. So, CDC is applied on the call.
• The flag is enabled and a match is found in the Do Not Apply CDC for calls matching with numbers
list in the CDC profile. So, CDC is not applied on the call.
• The flag is enabled and a match is found in both these lists. The system gives precedence to the Do
Not Apply CDC for calls matching with numbers list. So, CDC is not applied to the call.
• When CDC is applied on the call (see point a above), the CDC Timer starts as soon as B has answered
the call. This timer is set to 160 seconds as default, but can be configured for the desired time limit.
• At the end of the CDC Timer, the CDC Goodbye Timer starts. This timer provides a grace period of 20
seconds for the user to finish the call. This Timer is fixed.
• At the end of the Goodbye Timer, the call is disconnected, if the Disconnect CDC after Timer flag is
enabled.
• If this flag is disabled, the call will not be disconnected.
• Instead, the CDC Warn Timer will be loaded again. The user can know how long s/he has been talking.
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