Identifies the circuit number used by the customer.
NOTE 1: VC_CKR is used by the customer as a cross reference to the provider EVC ID(s) or PVC ID(s) and in many cases to identify the customer's end-to-end service.
USAGE: This field is conditional.
NOTE 1: Required when the EVCCKR field on the EVC Form or the PVCCKR field on the PVC Form is populated, otherwise prohibited.
DATA CHARACTERISTICS: 53 alpha/numeric characters
EXAMPLE: L 0 0 0 2 - 0 0 2 4