Magazine admits its phone call prompted senator 's confession . Publisher Larry Flynt had a reward for information . Reporter is on phone with alleged reporter notified Flynt . Sen. David Vitter admits his phone number appears in escort agency 's records .
Magazine says its phone call prompted senator 's confession . Publisher Larry Flynt had offered reward for information . Journalist working on book with alleged madam notified Flynt . Sen. David Vitter admits his phone number appears in escort service 's records .