Identifies the ICFA3 as a provider carrier system.
VALID ENTRIES:
Y = Provider carrier system
USAGE: This field is conditional.
NOTE 1: Optional when the first position of the REQTYP field on the ASR Form is “A”, “L” or “M” and the ICFA3 is a provider carrier system.
NOTE 2: Optional when the first position of the REQTYP field on the ASR Form is “E”, “R”, “S”, “V” or “X”, the NC code on the service specific form does not specify a virtual concatenation service and the ICFA3 is a provider carrier system.
NOTE 3: Otherwise prohibited.
DATA CHARACTERISTICS: 1 alpha character
EXAMPLE: Y