Identifies the provider service order number for the access circuit.
USAGE: This field is conditional.
NOTE 1: Optional when the first position of the REQTYP field on the ASR Form is “P” and the PVCI or EVCI field on the ASR Form is “B” or blank, otherwise prohibited.
DATA CHARACTERISTICS: 17 alpha/numeric characters
EXAMPLE: C 8 6 0 2 4 1 6