Directory number controlled by the BCR subsystem of CallPilot to route callers to available channel resources. CDNs are a limited resource on the switch.
A typical configuration for CallPilot requires that two CDNs to be configured on the switch: one for voice call answering, and one for fax call answering.
All other services can use a phantom DN that is forwarded to one of the two CDNs.
See also: Blue Call Router (BCR)