A vector directory number (VDN) is an extension number that connects an incoming call to a specific vector. This number is an extension that is not assigned to a device. The system administrator can map each VDN only to one call vector.

A VDN represents a call type or a service category, for example, billing or customer service. Multiple VDNs can point to the same vector or to different vectors depending on the call treatment.

The administrator can specify a VDN return destination for the post-call treatment. VDN return destination is a VDN extension to which the contact center routes the call for the post-call survey when an agent completes the call before the caller.

For more information about configuring VDNs, see the VDN configuration section in Administering Avaya Contact Center – Extended Capacity.