You cannot utilize a tac to seize a member of a PRI trunk group. If you want to test it, place it in a new route pattern and then point a specific phone number to that route pattern in your ARS tables.
If the telco allows it you can use the verify button. Place a verify button on your set. Press verify you get dialtone. Dial tac code. followed by the member you wish to test. You get dialtone. Dial a working number and test.
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