Area code (three digits)
Area and exchange code (six digits)
Complete national number
First six digits of a 700, 800, 900, etc. number
Complete (ten-digit) 700, 800, 900, etc. number
The criterion for this trigger is met when a call is made to any NANP number to which the trigger has been assigned. Calls made by any originator (line, private facility trunk) using the NANP can encounter the trigger.
17.2.10 Terminating Attempt Trigger (TAT)
Terminating attempt triggers (TATs) can be assigned to directory numbers covered by the SSP exchange. Any TAT detected during processing in the terminating null state is considered to be encountered.
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