Identifies the end user's CRIS or other billing account number which may also be the end user local exchange telephone number.
NOTE 1: This field is used by the customer to specify billing to an end user.
NOTE 2: When this field is populated, the end user contact address information is not required.
USAGE: This field is optional.
DATA CHARACTERISTICS: 12 alpha/numeric characters
EXAMPLE: 2 0 1 M 8 1 - 3 5 8 7