Identifies the telephone number of the customer's technical contact.
USAGE: This field is conditional.
NOTE 1: Required when the TECH CON field is populated, otherwise prohibited.
DATA CHARACTERISTICS: 14 numeric characters (excluding 3 preprinted hyphens)
EXAMPLE: 7 0 3 - 5 5 5 - 1 4 8 4 - 2 2 6 4