PTN - Plant Test Number

Identifies a plant test number that is pre-assigned when the telephone number assigned to a service cannot be used for testing purposes.

NOTE 1: Availability is based on the type of switching termination and the provider’s practices.

USAGE: This field is optional

DATA CHARACTERISTICS: 7 numeric characters (excluding 1 preprinted hyphen).

EXAMPLE: 6 5 4 - 4 3 1 2.