WRO - WATS Recording Office

Identifies the switching machine that provides Automatic Message Accounting (AMA) recording for terminating service.

NOTE 1:  The first three characters identify the NPA (numeric plan area) number.

NOTE 2: The last three characters are either the central office unit number or the toll tandem screening office number.

NOTE 3: The central office unit and the toll tandem screening office subfields are mutually exclusive.

USAGE: This field is optional.

DATA CHARACTERISTICS: 7 numeric characters (including 1 preprinted hyphen)

EXAMPLE: 2 0 1 - P C R