You can use VDN Override when:
A Computer Telephony Integration (CTI) application has set up an ASAI VDN or station event-notification association.
The CTI application requires the called number ASAI message information to be the active VDN extension associated with the incoming trunk or internal call rather than the called number digits contained in the ISDN SETUP message for the incoming call.
VDN Override is useful for a CTI application that is monitoring a call where the active VDN extension is changed by the following vector scenario:
An incoming call is routed to a VDN. The vector prompts the caller to enter more than one digit.
The call is then routed to a subsequent VDN by a route-to number or route-to digits vector step.
