Values: false (default), true, {integer list or range}

Description:

Controls whether numbers in transcription output are checked by the Luhn algorithm, which is used to validate different kinds of sensitive numbers, including credit card and personal identification numbers.

When set to true , the ASR engine identifies Luhn-valid numbers with 15 or 16 digits that are detected in transcripts.

The luhn tag also accepts a comma-separated list or hyphenated range of integers, or a combination of these integer arguments.

When set to a comma-separated list, the value specifies the exact number of digits in the numbers to be checked by the Luhn algorithm. For example, specify luhn = 3,7,16 to identify all numbers with 3, 7, or 16 digits that pass a Luhn algorithm check.

When set to a hyphenated range, the value specifies the lower and upper bounds for the number of digits in the numbers to be checked by the Luhn algorithm. For example, specify luhn = 8-10 to identify all numbers with 8, 9, or 10 digits that pass a Luhn algorithm check.

These integer arguments may also be used in combination. For example, specify luhn = 8,13-16 to identify all numbers with 8, 13, 14, 15, or 16 digits that pass a Luhn check.

When a transcribed number is identified as Luhn-valid, the word-event that generated the Luhn-valid number is flagged in the events object contained in the JSON transcript's utterances array, and an occurrence is added to the count tracked by the value of textinfo > tags > luhn in the JSON transcript's textinfo object.

Luhn-valid numbers are not redacted by the luhn tag, and the luhn tag may be used independently of redaction functionality. Numbers that are redacted, but passed the Luhn check before being redacted, are still flagged with a luhn tag in the utterances > events object.