Identifies a specific product or service offering associated with the facility assigned to the digital interface being provided to accommodate the request for Cellular Switched Access lines or trunks.
NOTE 1: FSPEC may be applicable for circuit level features and options other than those already identified by the T1 Network Channel Code (NC1) and Network Channel Interface (NCI) codes.
VALID ENTRIES:
Positions 1-7 = any alpha character except 'I' or any numeric character except 'O'.
NOTE 1: Valid entries are based on AP tariffs/practices.
USAGE: This field is optional.
DATA CHARACTERISTICS: 5 alpha/numeric characters minimum, 7 alpha/numeric characters maximum
EXAMPLE: B D 1 T 5 A B