Identifies the NPA/NXX blocks that reside in the customer's switch/node for the local exchange service being provided.
NOTE 1: The C.NPA/NXX specified is associated with REF A. Additional ASR (s) and TQ(s) are required when C.NPA/NXXs are associated with multiple trunk groups.
NOTE 2: This field may be used for originating traffic translations. Originating traffic is defined as traffic from the provider to customer when the request is issued by the customer.
NOTE 3: This field may be used for STP routing purposes.
VALID ENTRIES:
NPA/NXX = 10000 Block
USAGE: This field is conditional.
NOTE 1: Required when the first position of the TQ field on the ASR Form is “C”.
NOTE 2: Required when the first position of the TQ field on the ASR Form is “M” or “X” and the DIR field is “1O”, “2O” or “2W”.
NOTE 3: Required when the first position of the TQ field on the ASR Form is “E” and the PCU field on the Trunking Form is “1”, “3”, “5”, “7”, “B”, “C” or “D”.
NOTE 4: Optional when the first position of the TQ field on the ASR Form is “M” or “X”, the TRFTYP field on the Trunking Form is “E9” and the DIR field is “1T” or “2T”
NOTE 5: Otherwise prohibited.
DATA CHARACTERISTICS: 6 numeric characters
EXAMPLE: 4 1 5 9 2 7